Say that Garrett is telling the truth. Granted, he's clearly a disgraceful lying opportunist, but imagine he wasn't.
Rudolph uses a word that players have been saying back and forth all game long and suddenly Garrett loses his crap? Because a dorky little QB said something? I doubt that. There isn't a roided up freak in the league that rages on that level as a result of a racial slur.
Now back to MG being a liar. There isn't a QB on this planet dumb enough to use that slur knowing that his head coach, half of his OL, and the majority of his team are black. That would be sheer idiocy that would end his career.