Harsh words, usually said in anger, aren't easily forgotten and are very, very hurtful (no matter what your age) and it will break a spirit. So no matter how mad you are, bite your tongue and think before you speak!
Showing my true, real self is hard. Bullied, teased, made fun of for who you really were is hard to come from. That's why people put up walls, barriers, masks, to hide behind. They're afraid that people will do it again, just like the people before.