Unless you plan on doing a lot of taunting (which is looking increasingly unlikely), you should be just fine.
I'll second that. I was a little worried the first time I wore Astros stuff to a game in Philly, but I had no problems. The worst I've received is anonymous "Astros suck!" calls while walking to my car after a game.
Citizen's Bank is nice, but not anything special. I think Philly got stuck with the 2000s equivalent of the cookie-cutter park that Veterans Stadium was. The only unique thing, I think, is the assortment of local eateries out beyond centerfield -- supposed to be some good local food there (at ballpark prices, of course). I stick with nachos at ballgames, but several friends here rave about The Schmidter -- some sort of Philly cheesesteak on steroids, I think.
