I haven't been there, but I have friends that are giants and skins fans who have been to several games. My boss is giants fan, and used to go to philly/giants game in philly every year. He stopped going because "too many drunk aholes fighting each other and anybody they could". Also said he stopped bringing his kids because of the "chorus of cursing" he encountered at every game. Another friend worked for what was the "Official Radio Station" of the skins. One year he was asked to work the game in philly. He drove up some equipment in the radio station van, which had "Home of the Skins" and the skins logo on it. After the game, he found all 4 tires slashed, and the windshield smashed. And the eagles won that game! Pretty fun end of a workday for him.
But yeah, you're right, nothing but classy fans at eagles games. Just ask the vikings fans who went to the NFC Championship game last year. They looked like they were having a blast as they walked into the stadium. Who doesn't enjoy having hundreds of people yell the f-word at them, sticking their middle fingers in their faces, and having beer thrown at them?