I wish a classmate fails her year
Thats rude. Why would you want her to fail?
I think she is stupid and I hate her
It's mean to wish something bad happens to someone you don't like. You shouldn't be so petty.
It's whatever. She is mean to me.
Even if someone is mean to you its rude to hope something bad happens to them. Have you tried talking and being nice to her? She might respond back in the same manner.