Which sex position results in the ugliest children ? Ask your mother.
Why do you think i's acceptable to make fun of people and call people ugly?
Because it's funny, also you have your own jokes about ugly people. It doesn't hurt right?
It's okay to joke around with others, but when you say things that are meant to be mostly hurtful it could very much turn them against you and hurt them bad. How would you feel if someone just randomly made a joke putting down how you look?