I'm not sure what sort of proof you guys really want about these rumors. The media and slavering Favre fanatics did their utmost to shield their darling from the repercussions of his actions for decades. But the rumors were always there.
I was hearing the truth about Brett Favre's personality from people who live or lived in Green Bay years before he left the Packers. The stories I heard from multiple sources about his off-field behavior were quite in keeping with his on-field behavior: undeniably brilliant, yet wild, erratic, brash, reckless. There's a saying among poker players that the better one knows the personality and lifestyle of one's opponent, the better one can predict his on-table playing style, and I believe the same can be said for football. While Steady-As-She-Goes Rodgers is eating at fine restaurants, then retiring early to watch film, Interception King Favre was out carousing till the wee hours and doing his damndest to steal other men's wives.
The fact that Brett Favre can summon tears on cue and can't stand by an opinion for more than five minutes at a time doesn't alter the fact that he was and is an asshole, and that Green Bay fans kept their heads studiously in the sand about his off-field behaviors for years.
Yet they immediately seized upon Aaron Rodgers' peccadilloes and made media hay of them. How cute.
I don't know why we're still talking about this, though.