Seems you actually got off lucky. Usually when someone takes the furry thing too seriously they go off on a tangent about their fetishes and talk to you non-stop and get offended when you point out they're annoying you. That dude mostly just sounded mildly entertaining.
"shakes head" There's a time and place for everything, but the way your friend act in your dorm is not one of those. Do your friend even thought about if it's okay to act like that in someone else's place?
Well, just don't be with him again or either, talk to him about it that it gotten on your nerves so maybe, he may change a bit or not. It depends. Totally random on people i guess. If there's a pet in the house (cat or dog), i usually play with play like going on the floor, eye level, and just be like them if possible. (but i will ask first, maybe not if no one is around ).
For furries or whoever, there are people who will respect you and will not. I wish they ask first if it's okay with you before role playing or being themselves.