I don't know when it happened, but at some point in his career at Green Bay, Favre decided he was the defacto head coach/general manager of the Packers. He would demand certain players be signed or resigned (Moss for example). He tried to get Steve Mariucci hired as the Packers' head coach and pouted when they didn't (and remained bitter up to the very end about it). At some point, Favre stopped caring about the team and started to only care about Favre. That went all the way down to giving him his own separate lockerroom area (talk about building team unity).
I used to respect the guy, but he has become everything that I hate about the sports. He turned into an ego maniac, premadonna who thinks he is bigger than the team and his teammates. If he didn't have such a great relationship with key members of the media (yes, Maddon, King, and Mortensen I mean you), he would be as much or more a pariah as TO is.