How can we totally humiliate this kid in front of the WHOLE SCHOOL?

He sounds really really really interesting. If I were you I'd just act the same way he does to you, to him. Go complete apeshit on him and see how he reacts. Or just tell a teacher? I don't know how different it is here compared to there in your school. But if a kid acts like that and talked/did those things they would be suspended. Hahah.