Question

prompt your friend behaving rude

Answer 1

we could tell our frnd to behave in a gud manner.
could give him some kind of lecture lyk things.

Answer 2

If my friend is being rude with me and others.First I have to ask his/her why he/she behaving rude.
Second If he/she having a problem.I suggest his/her to talk with his/her parents because parents can solve the problem and tell us what to do.