I sat next to a really rowdy Pens fan. Came in with a group of 5, all Pens fans except me. We got to the game about 3 minutes in thanks to the restaurant we were at losing one of our tickets. Guy starts chanting "DON'T SIT NEXT TO ME!" I decided, screw it, I'm sitting next to this guy (really had no choice since the other folks were coupled up). Made it pretty clear I was not a "Richard", and it was cool after that. Friendly rivalry, which is the way it should be.
I know there are some people who are just out looking for a fight, but if you're a sane person, and you're in that situation at an away game, just get away from it.