The most interesting part of your detailed and correct assessment of the matter is your observation regarding HOW Eagle fans view Cowboy fans in general. They've concluded that Cowboy fans are "uppity" or rich and arrogant, with a sense of entitlement. Something to that effects. In general, THEY feel that WE feel that WE'RE better than them in as a "class" of citizenry.
I was born and raised in Wilkes-Barre/Scranton PA., and lived there the first 19 years of my life (1960-1979). Few kids recall HOW they became a fan of a given team at the age of four years old, but thankfully, by Gods grace and mercy, I somehow latched onto the Cowboys in 1964. Life in PA as a Cowboy fan was "no disco", because I had to not only deal with the Beagle bottom feeder Phans, but also Giant and Steeler folk as well. It was rough.
But I tell you this because, being from there, the above stated mindset, in general, is the "default" position of the vast majority. Not only as football fans or sports fans et. al., but most people just walk around pissed off, nothing nice to say about anyone, and resentful and bitter toward ANYONE who even smells of "success". It's that good ole' "steel worker/coal miner/union" mindset that see's the world in negative terms from the time it wakes up in the morning. They're just LOOKING for something to complain about. It's "psychology 101"..............put everyone and everything around you DOWN so as to make yourself feel better about your self-inflicted crappy lot in life.
In my house, my neighborhood, my community, schools, etc.............everywhere you go and everyone you meet.........nothing nice to say about anyone or anything. Life basically SUCKS, so therefore YOU'RE LIFE must suck too.
Take it to Lincoln Financial Stadium, or over on the IGGLPHANS forum, and you see that they're just simply applying their general disposition toward EVERYTHING toward the sports they follow.
I got the shock of my life when, in 1979 I moved to Houston. I was literally stunned and shocked to actually be in a community that celebrated success. People who settle for the mediocrity that this life offers to those without drive and dreams and daring to make something of themselves. I, of course still have a lot of family in PA., and nothing has really changed. I am now the source of much angst and consternation, bitterness, jealousy and scorn, simply because I ended up in Hawaii these last 22 years. As if I moved to Hawaii just to get under someone else's skin or something!!
But that's the way they see it up there. I'm all "uppity" and arrogant, rich and "better than them" simply because I had a little nuggets to chase a dream or two.
Of course they utterly despise the Cowboys, and viciously HATE Cowboy fans. Because the Cowboy/Eagle saga is a micro-ism, a window into the overall nasty disposition of the Philly populace in general. "We suck". "You win, and we can have that because WE can't win." "So therefore, we must assualt you, besmirch you, and call you every gutter-sniping, bottom feeding maggot name we could think off". "Maybe we will even physically assault you, because your success is pissing us off............."