PRIDE and UFC star, Antonio Rodrigo Nogueira, or 'Big Nog' has a conspiracy theory. He thinks there's a rivalry between American's and Brazilian's, and he implies that MMA Judges in the US are biased against the Brazilians.
"Americans have a rivalry with Brazilians, that is obvious. And why is that? It’s because the UFC has three hundred fighters under contract, and from those three hundred fighters we are fifty. The Brazilians are fifty, and we have more belts than they do."
"So from three hundred we are fifty, and with those fifty we get there and take care of business. They win (more) because they have more (people), they have a bigger infrastructure inside their gyms, they have support for the sport since they’re kids. But the sport is growing in Brazil and I believe that..."
"They look at us with (malicious) eyes, let’s say it like that. If you’re going to fight an American in the US you have to win the fight with emphasis because otherwise… You can’t win it by a thin margin."
Off the top of my head, the only controversial decision involving a Brazilian fighter losing to an American fighter recently, would be Lyoto Machida losing that razor thin decision against Quinton Jackson. For the record, I do disagree with that decision, but even then, it was a really close fight, and it wasn't really a robbery.
We do see a few crazy scorecards every now and then, but I don't think we can really blame that on nationalism, racism, or whatever, rather than them simply being bad at judging fights.
Nog's brother, Rogerio was even awarded one of those controversial decisions. I wonder if Jason Brilz has his own conspiracy theory on this.