Yep, he has a glorious reputation in the world of sports. Just ask the Atlanta Falcons.
He's a college football coach. Most of them are douchebags.
NFL Coaches have no loyalty to their teams, because their teams have no loyalty to them. No doubt that during any kind of rough patch they would have ditched Petrino IN A HEARTBEAT. Sometimes, they even do so midseason. Anyone with any familiarity with the Atlanta Falcons organization knows it is not ran well and they do not have loyalty to their players or coaches.