I concur that both the Diaz brothers and Sonnen are douches. But please, enough with 'Bisping only gets hate because he's British.' talk. The vast majority give him hate because of his actions.
I agree, I don't think it's an English thing at all.
Whenever I go to America (which is quite a lot) I met dozens of American's and I have never once encountered a single one who didn't complement me on my accent and say how they would love to go to London etc.
I don't think the American audience has an agenda against the English at all.
As for Bisping personally, if I remember correctly he was pretty well received when he won the TUF. People liked his personality in the house and he backed it up by winning the whole thing.
I saw him fighting during UFC 114 and I was the only English guy around and all the american's around me were booing a lot. Everyone one of them I spoke to said they hate him and hope Miller kicks his arse.
I suggest the main reason for this was the Hamil fight. The American fight fans thought Hamil was a clear winner and Bisping got a home town decision against an American fighter (you can understand the resentment of this surely?) plus on top of this he was talking smack about Hamil (someone who had the backing of most fans for his achievements inspite of being deaf etc)
From there on Bisping was placed in a pretty controversial position of captaining the UK team vs team USA in his next TUF appearance. He played the role of being the enemy captain well and he was getting under the skin of the Americans (this would have happened to pretty much anyone unless they behaved like GSP because of the fact he was opposing team USA)
So he got under peoples skin, his team won mostly everything and he was hardly gracious in victory. He was rubbing the American's noses in his teams victory and the reason this annoyed people because everyone was aware that his real challenge was still to come (one he failed pretty heavily against Henderson)
TUF is such a large platform for fighter personality and being in Bisping's position as an already hated captain of a team going against team USA is very very likely to only further enhance his role as the hated heel (much like Koscheck to the Canadian's before fighting GSP)
I don't think there is any anti English sentiment from American fight fans (or american's in general) Bisping just has a personality that has potential to be loved or hated and circumstances transpired after the Hamil fight and his Coaching role on TUF to make him hated more than loved (especially in America)
Koscheck, Tito have been in similar positions yet neither are ENglish. It's a matter of personality and how events unfold that dictate how you are perceived by the fans.