I'm going to make fun of a girl
Is it because she rejected you in some way?
No, I just think she is ugly
It is not good to be mean to other people even if you don't think they are attractive. People will think that you are a bully.
I don't care if others think I'm a bully. I can do what I want and I don't like that chick anyway.
Why wouldn't you care if other people think you are a bully? It would isolate you. Do you want that?