Straight forward approach is not easily appreciated by bosses and they feel we are arguing with them.Is this right?

Upward management (i.e. workers managing their bosses) is an important skill, and the principles are similar to ordinary management.  If a manager says "Do it like this" and you reply, "No, that way is better." the manager may feel that his competence or authority is being challenged, or that you are being argumentative.   It's usually better to say "Good idea boss.  Hmmmm .... I wonder ..... Boss, I've had an idea that might make production more efficient. [Bosses can't resist an idea that will make them look good to their bosses.]   Do you want to hear it?  Yes?  OK, well how about if we did ..... [don't propose the whole change, just one small detail.  Repeat over time for the other details]"

Remember that bosses are people too.  How would you feel if you said "let's do this" and your child/husband/wife/dog/neighbour said "No, that's wrong, do it like that"?   Exactly.

Having said that, the standard approach - when you know you are right, have double checked it, have the support of the team, and can prove it - is simply to ignore the boss and do it right.  Half the time they'll never even notice.

I would say not in every situation. At times, we ought to maintain a different approach to the organization's interest without diluting the ethical standard that a professional needs to carry through the services. A high amount of professional judgment is involved in stating whether a specific matter is an argument or agreeance.