Do people give rude answers only to make them feel better?

All I know for certain is that giving a rude answer has never actually made me feel better, but I can only answer for myself.

However, if I were to guess, I would think that if someone gives rude answers its either an expression of frustration or anger, or it's a character trait they were allowed to develop as they were growing up. Either way I've never actually studied this, so I could be incorrect.