I'm a Western NY native who has lived in Philly the past several years. I've also been to the last two games the Bills visited down here, including Sunday's debacle. The only bad experience from my perspective either time I've seen the Bills play here was the team's product on the field.
The thing you have to understand about Philly is that it's actually got a lot in common with WNY. It's a hard-working, blue collar city with a distinct regional identify that is often misunderstood and maligned by outsiders that know nothing about it except what they've heard. In reality, it's a criminally underrated city with amazing history, food and culture. In my experience it's a city full of down to earth people who happen to be diehard fans supporting their city's sports teams.
Philly fans get a bad rap based on stories from decades ago, but to be honest I've seen and heard of worse at OBD in recent years lol. This Sunday I got plenty of good-natured heckling from Eagles fans, and sure, also had a few "birds" flipped my way, but I gave it right back and they loved it. Some of them sitting nearby and walking around the concourse were actually pretty hilarious.
Someone else said that the Bills are a neutral opponent for Philly, and that's true. We're about as neutral as they come for a visiting team here. In fact, I wear my Bills gear around town almost daily and almost always get positive reactions or genuine questions about the team. To be fair though, I'm not sure I'd roll up to the Linc in Dallas gear...they absolutely HATE the Cowboys here. Maybe even more than we hate New England, if that's possible.
Anyway, this post wasn't meant to slobber all over Philly and it's fans, which like anywhere else has it's problems and bad apples. Just wanted to provide some balance and perspective from a diehard Bills fan in the heart of Eagles country.