By Andrew Holleran The Dallas Cowboys are arguably the most-popular franchise in the National Football League, but they’re losing some fans this offseason. It’s been a rough offseason for the Cowboys, who have lost wide receiver Amari Cooper to the Browns and Randy Gregory to the Broncos. Some Dallas fans are fed up. In fact, some are even announcing that they are no longer fans. NFL fans have taken to social media to react. “I held a press conference in 1998 to announce that until the Cowboys hired an actual GM and Jerry Jones played the role of “just owner,” I would not be spending money or …