Most NFL teams are jealous of the Cowboys to a certain extent. It must be galling to constantly hear the phrase "America's team" and to see so much media hype about the Cowboys players & to endure so many Cowboy fans at other stadiums cheering for the Cowboys. I remember just before the game against Miami last year that Jason Taylor went along the fence where some Cowboy fan had hang a Cowboy banner and ripped it down.
Some football fans & players on other teams see/think the Cowboys are arrogant when they run out into the field. That's plain dumb cause they run out the same way as any other team, but teams/players see what they want to see.
Just imagine how tough it is to be in the NFC East. The Skins, Giants & Eagles are all older teams who've won championships before the Cowboys became a franchise. Yet, since the 60s we've gone on to win more SBs (then any other team except the 49ers & the Steelers) and played in more SB games then any team. Giants play in the largest market & have won 3 SBs, the Skins play in the nations' capital & have won 3, the Eagles haven't won any SBs but have lost 2. And there sit the Dallas Cowboys with 5 SBs and a host of charismatic players throughout the the years with more greater players during those years then any of our 3 rivals.
You better believe they hate us; isn't hate the highest form of flattery. In reality they want to be like us if they can't play for us.