the one you just called fat, she is the one starving herself and she has lost over 30lbs. the one you just called stupid, she has a learning disability and studies 4 hours a night. the one you she called ugly, spends hours putting makeup on hoping someone will like her. the one you just tripped, is abused at home.
theres a lot more to people than you think. don't put somebody down before walking a mile in their shoes.