It's the VIDEO music awards. And the You Belong With Me video is better than the Single Ladies video in my opinion. The Single Ladies video was all sex and dancing. (Just my opinion, and I know that a lot of people voted on the songs and not the videos).
And even if Kanye didn't agree with the way things went, it wasn't his place to jump up on stage and take Taylor's moment from her. The majority of America (and whoever else was eligible to vote?) chose her, not Beyonce, and that's just the way it was and what the people wanted.
Haha, I don't hate you, but I must say I disagree. ;3