I'm not sure there is a proper way, but I would think if it did happen he would have mentioned it at some point during the scrum within earshot of someone.
In some cases I would agree, but if Rudolph really did use some type of slur, there is no way Garrett would or should have waited until this point to let it be known.
Now I have to wonder about the validity of the story about the guy to stopped to take a picture with Garrett then punched him in the face. Whatever came of that anyway?
The die has been cast. Next step when things start really going sideways is to claim mental instability caused him to commit assault and utter untruths.
The race card gets thrown around so freely these days, I think this allegation will come to pass and probably have little impact on his reputation.
They should give him an additional 6 games for being and rabble rousing #######.