It can be really difficult to take criticism well. Especially if the person giving it didn't word what they were trying to say well (ie. it came off as rude or something).

I personally take crit with a grain of salt. I try to see what they were saying. Sometimes I find that I agree and sometimes I don't. If I agree with a change that was suggested then I'll work on it. If I don't then I just ignore it.

Remember that everyone has opinions. Those opinions may not mesh well with your opinions but they're just as valid as yours are. People offering crit aren't trying to put you down. Most of the time (I say "most" because I can't speak for everyone) they're just being honest and trying to be helpful.