College students already belong to adults. Adults should handle things in an adult way. If you are bullied by others, you should tell him severely first. Now they are playing a legal society, not bullying casually. You reason with him because we are all civilized people with higher education, and we are not afraid of him, just don't want to affect our future because of contradictions. If he doesn't stop bothering you, you can report it directly to the school.