The Philadelphia fanbase is unfairly stereotyped for utter nonsense, and one famously misunderstood incident involving Santa Claus. The Philly fanbase is generally one of the most passionate and knowledgable groups around. The fanbase has unfair expectations, but as a top/large market, it wants championships which have clearly been in short supply. The Reid/McNabb/Philly dynaic is fairly unique in pro sports, in that it's nearly totally unprecedented for a pro coach to have a 14 year tenure without winning a single championship. To even reach that long of a stint, obviously you have to win a hell of a lot of games, but when you spend a decade steadily competing at the upper echelon and flirting with greatness, expectations balloon. I will almost remember the Reid era fondly, and I don't know many people who feel differently.
And, again, as someone who's actually in the area, and is surrounded by Eagle's fans, the overwhelming majority of fans are happy for Reid and acknowledge that he was the greatest coach in team history. No one is hyping this as some sort of revenge game, even if you listen to philly sports talk radio, which I've done for a few hours today, no one is trashing Reid, and it's being hyped as a big game because it is for the Eagles given the way the division is lacking a frontrunner and the fact that there's still a lot of uncertainty around just where the team stands.
But, people like yourself, with no real knowledge, just continue to perpetuate an easy, convenient narrative about Philadelphia.