Why do guys say mean things…?

In high-school when I was performing my scene as a the protagonist talking to the mirror saying “mirror mirror on the wall who is the prettiest of them all” this random guy in the crowd said not you. I felt so embarrassed since it was in front of everyone as well as it really impacted my self esteem. I don’t understand why some guys are so mean… how would they feel if someone shouted an insult at them on stage? Can someone tell me why some guys are jerks? And what their motivation is from saying something like that…
Why do guys say mean things…?
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