How can I handle arrogant employees who don't respect their seniors?

If you have an employee that is arrogant and lacks respect for senior memebers you have a real problem and it should not be tolerated.
Resepect is optimal for an effective work environment.
 There is no place for arrogance in the workplace.
Everyone has to contribute100% of their efforts to maintain success.
There is no place for no big I's and little you's. 
If nothing else the employee who is a junior level employee shoud respect the level or years of experience that lend one to be a senior employee.
You don't have to like a senior or even agree with their point of views.
The senior deserves respect.
If the junior refuses to give that respect you need to pull them aside and tell them that there attitude is distasteful and has no place in your organization.
Tell them they need to get with the program do not tolerate dissrespect or you will have anarchy on your hands. 
It maybe that this employee is valuable to you.
You have to look at that value against what you will lose relative to allowing conflict to remain in your ranks.
Let them know they are valuable but you can't tolerate behavior that will seperate and divide the ranks.
Your employees working as a team is of utmost important in this competitive environment. 

ARROGANT PERSONALITIES:1.
Look at them as first a person - an arrogant person tends to have an unhappy personal/social life.
Get to know them, you may be surprised to find that they too have a story and there will be something that is making them extremely angry.
Unfortunately, instead of dealing with it, many arrogant people have no outlet other than work and this is where they let loose with inappropriate behaviour.2.
Arrogant people are very insecure people, they feel they are not good enough and everyone is a threat (in their minds).
So rather than just be themselves (they feel like failures) they choose to overcompensate for their deficiencies by projecting their fears onto others, in the form of being over aggressive, shouting at people, talking rudely to people, interrupting people, rumour mongering, gossiping and lack of social skills in communicating in an acceptable manner.3.
Arrogant people want the world to revolve around them.
They want to be centre of attention, to be flattered and to be continuously praised.
Notice the 'me' first attitude.4.
Arrogant people are fearful that their flaws will be seen and will work hard at trying to show that they are 'better' than everyone else.
Everyone is an 'enemy or is seen as 'weak' in their eyes, older, management/senior role etc.5.
Arrogant people keep company with arrogant people.
This is how they maintain this charade for so long and get away with atrocious behaviour.
DEALING WITH ARROGANT PEOPLE6.
Be assertive and in control around arrogant people.
Show that you are not scared or intimidated by them.
Don't be confrontational, just quietly confident within yourself.
Stand facing them and look them directly in the eye.7.
Listen to what they have to say (to them it is important, even if it isn't to you).
Arrogant people like an audience, it feeds their very weak egos.
Then have your say.
Stay focussed and don't be distracted by what the arrogant says that has nothing to do with your conversation.
Once you have stated your points, repeat them clearly and ask if the arrogant person has understand.
If understands discussion over.
Highly likely that the arrogant will look for excuses or try to make you angry - ignore all attempts to sabotage your professionalism.
If the arrogant has valid points of concern, highlight what THEY can do to address this.
Be supportive but put the onus is on the arrogant person to meet you half way in the discussion.
The fact remains that an arrogant person has no excuse for behaving in this manner anyway, no matter if problems or not.
They must learn to deal with conflict and issues and then look at action plans and ways forward.
Being arrogant only allows a person to standstill and make no decisions.8.
Arrogant people tend to be cowards.
Be persistent in working to a high standard of professionalism.
Do not let your standards drop to accommodate arrogant people Many times arrogant start to look at you differently if you show that you are happy in your own self, have a life and have bigger things on your agenda.
Arrogant people can become respectful and secretly may want to become your friend.
Of course, beware, but the main thing here is to be yourself throughout the process of dealing and working with arrogant people.9.
Some where along the line, someone told an arrogant person that they were good at something, good looking or maybe something bad happened to them and they haven't learnt or don't want to learn how to mature or take responsibility for their lives etc.
It only takes one person or an event to shake them up and either stop their behaviour or control their behaviour.10.
Arrogant people learn the things they learn the way they want to learn them.
They cannot be forced to change.
For yourself, adjust how your interact with them.
Keep distance if possible.
If not possible, keep communications with them brief, firm and professional.
They will deal with you the same way once they realize that they cannot manipulate or intimidate you.

first of all you have to know if this person is having aggressive attitude in general towards all other employees or with one person in particular.
if this employee have a problem with one senior in particular, try to sit with him alone first to know the reason for his behavior and then sit with his senior to listen to the problem from his point of view.
once you put your finger on the cause of the problem set a meeting for both of them and ask them both to behave professionally and let any bad feelings out of work.
give it sometime, if it does not work separate them.
if that employee have attitude problem in general, try to find what is his capabilities and try to give him tasks which he can perform alone.
some people tend to work alone better than in teamwork.
for example, you may find a genius programer when he works with his computer he does miracles but ones he is working with the others he starts causing problems.
if your employee does not have the qualifications and causing trouble all the time to his peers and seniors and all your efforts went for waste, just give him a warning then give him the kick out.
and while recruiting remember the golden rule "hire for attitude, and train for skill"

Be calm and try to understand their problems.
Make them realise how to respect few people in their life, then their work area.
Try to teach them professionalism.

Focus on behaviors First, I’d suggest that you focus on the behaviors (late to meetings, not making a presentation after a conference, missing appointments with you) that aren’t acceptable, vs.
talking about how it feels to you (dismissive, disrespectful, arrogant).
It’s much easier for people to hear about behaviors that you want changed; if you tell someone they’re being “disrespectful,” it feels like you’re saying they have a character flaw – and they’ll simply become defensive and tell you all the reasons it’s not so.
Start by listening Second –and this may be the most important – when you sit down with them, I’d recommend you start by listening.
This may seem counter-intuitive, but we’ve found it extremely helpful.
Here’s how this works.
You ask to meet with those employees after the vacation, letting them know you’d like to discuss the difficulties the two of you have been having lately.
Then when you meet, begin the conversation by saying something like, “I want to share my point of view about how we’re working together and some things I’d like to see change – but first, I’d like to hear how you see it.
From your point of view, what are you doing that’s working in our interaction, and what do you think you could be doing differently?”