Some people are polite; some people are rude. Often, someone who is rude is viewed as being strong, but is he?
A strong person can afford to be polite. There is little need ever to be rude.
Imagine someone in a situation where he starts swearing. Was he handling the situation well before he started swearing? No. If he had been handling the situation well, he would not have started swearing, now would he have?
Be rude, and show you are losing. Stay cool, and that might help you win.