A girl in class treated me like a joke, so I raped her from behind. That's one joke she did not see coming!
I'll ask you again, why do you think that was an appropriate retaliation against her?
Rape's funny. Stop saying rape is not funny. It's funny for the victims
If you were serious about raping her, I would be encouraging her to report you to the police as that is a very illegal thing to do. If you were just joking, I do not think that it's something that you should say very lightly specially if people have been traumatized and severely hurt in the process. I suggest you contact your local clinic that cares for rape survivors, so that you would learn about their stories and not make fun of it.