How one should treat with a rude customer or an employee during while you have a lot of work?

we should not angry with customre we should makethem comfortable

in that case overtime will be  adjestable

We can treat with different type of idea with suitable to the customer  because customer never wrong

Number 1 rule, Customer is always right! so, if I will encounter such rude customer i will still consider her and give some time for me to understand her needs and when I am done with her I can concentrate with my work.