I think this episode really showed a lot about Brazilian culture. You can tell that they are very proud, and are all about respect. Vinny said it himself, that his fiasco with nog would have gotten someone punched in the face in Brazil. The argument between Nog and Vinny really showed how much pride Nog has, and when Vinny disrespected him, he would not tolerate it.
On a side note, I would love to go to Brazil someday.... anyone ever been there?