I don't feel that Big Nog over reacted.
That dude should have nothing bad to say about Nog under those circumstances. Vinny is trying to get IN to the UFC, Nog has already accomplished being a PRIDE champ and a UFC Interim Champ.
It probably hurt Nog's feelings that this guy is talking about him like that. And from his perspective, it hurts team morale.
Plus, as accomplished as Nog is, he's not talking any crap. Plus he's in a setting where he can't just kick the guy's ass for saying it.
BTW Mir is a nerd. That dumb, uncomfortable giggle he has everytime he talks to someone on his team is making me crazy.
Don Frye's Mustache > Kimbo's Beard