It is true that he said that about Mexicans. And this is what he said about Americans:
Everybody's very fat, everybody's very stupid, and everybody is very rude. It's not the holiday program, it's the truth.He also said:
Tonight, the new Viper, which is the American equivalent of a sportscar… in the same way, I guess, that George Bush is the equivalent of a President.and
250 million wankers living in a country with no word for wankerand
If this were America, it would be full of people doing… whatever it is they do. Incest, mostly, I think.and
They’re thick, humourless, over-governed and have no dress senseand
God may have created the world in six days, but while he was resting on the seventh, Beelzebub popped up and did this place.And I could go on searching for his jokes about other nationalities but I would run out of space to post them. If he is xenophobic then he is xenophobic about everyone. Or perhaps he is just trying to push people's buttons for a laugh. He plays a character in the show. He is an offensive condescending asshole. And he is hilarious at it.