You're kidding right?
Dallas fans, in whole, are some of the flimsiest, fickle, bandwaggoning fans in the league. Every game I have attended at JerryWorld has been overtaken by Saints/Bears/Steelers/Giants fans. Just last week, even though the Saints were no longer a post season team, their fans made more noise than the home team. It was like watching the game at home with the TV on mute. Down by 7 with a whole quarter to play and the Cowboys fans started leaving the stadium. The better part of 20 years since the Cowboys were relevant yet fans still want to talk about the 5 SB Championships. Many of their fans don't remember a Cowboys team that won something that mattered.
I have many friends that are Cowboys fans and are true fans of the team, but it isn't what is represented when I see the team's fans in general.