Well, that method actually makes the animal think that you are angry at their nose. But after a few times they manage to put it together.
If you are a sadistic bastard like me. I would have clocked him and YES pushed his face in it with malice. For more entertainment I would have given him a choice “eat it or get beat beyond belief”. After a few shots he would be chowing down on lumpy McNuggets.
If you were worried about him calling the cops you should have taken his wallet and pulled his Drivers license. Old tactic of “I know who you are don’t do anything more you will regret”.
I don’t think the guy would ever step foot back in that state much less the dorm.