Some people take criticism too seriously and it can touch them very deeply and for a long time... It can spoil their mood and unsettle them...
My idea is to treat criticism as a useful look from outside. However, we we should keep in mind, that people cannot know our character to the full, so try to analyze the critisicm and find out if it is true or not. May be the man who criticized you didn't want to offend you, but to point to some of yuor mistakes... So, now you have chance to see and improve it. Thank this man, instead of being offended with him!