Now, to be fair (no one should ever be beaten unconscious) but I remember years ago I was in Vancouver with a friend. We went to a Nucks vs Leafs game and wore our Jearsys. We got heckled lots and kept our mouths shut or laughed it off. It's kind of an unwritten rule when you are in enemy territory. We made a few friends who were Nucks fans and they stood up for us.
After the second Intermission we heard that a guy in a leafs Jearsy had a few too many adult beverages, mouthed off to some locals and had to be taken to a hospital. I'm not saying he deserved it, but there are certian unwritten rules.
Sadly, with dark instances like these there is usually alcohol involved.