Bills fans are actually pretty classy. Unless its the Patriots that come into town.
Went to the 2009 game in BOA stadium against the Bills. The fans that were in our section were Terrible. To the point a Buffalo fan tried to push a Panther fan down those steep steps. The wife of the gentleman that got pushed almost ripped him a new one had she gotten her hands on him. Security escorted his ass out of the stadium too.
So my opinion of them is not a good one.
I have been to games in Philly and Tampa.
Tampa I actually partied before the game with a group of Buc fans. Had a great time with them.
Philly was a bit edgy and not much smack talking between fans. I did gain 10 pounds just walking into the stadium. The tailgate food was incredible. I was stationed at the Naval Shipyard in Philly and wanted to see a Pro game. I was a Giant fan back then but couldn't get tickets to that game so I got tickets to the Viking game as I like them as well (Pre-Panther maniac days)
Minnesota was kicking their ass all the way to the final quarter and then Cunningham brought them back and won 32-24. I was pulling for Minnesota but WISELY not too loud. LOL