Same thing happened to me at a Phillies game. I made the ultimate sin of not being a Phillies fan. A security guy came to me before the game even started and said people were complaining that I was drunk/swearing/trying to start fights. This was of course all total bullshit. The guy let me stay (how nice) but kept glaring at me the whole game just waiting for an excuse to throw me out.

So the game ends, the Phillies winning in dramatic bottom of the 9th fashion. The walk out of the park and to my car was unbelievable. People flipping me and my father the finger, calling us every name in the book, generally being stereotypical Philly fans. Fuck them.

I know it's not everyone, but Philly will always be that city.