The girl you just called fat? She has been starving herself, puking her guts out losing over 30lbs. The boy you just called stupid? He has a learning disability & studies over 4hrs a night. The girl you just called ugly? She spends hours putting makeup on hoping people will like her. The boy you just tripped? He's abused enough at home, don't hut him even more. The girl you just called a whore? She was raped as a child and still doesn't know how to move on.
There is a lot more to people than you think.
"Don't judge a book by it's cover" That's the way I was taught.