I didn't see the mtv music awards and all I know is that Kanye West went on stage and said beyone should've one. Can someone please explain to me very carfully and calmly what happened? Cause everyones talking about it and I want to know.

Here's a video of what happened.

Okay, so Taylor had just won her award for "Best Female Artist" or something and she got up and was accepting it and thanking everyone. Suddenly, out of nowhere Kanye appears on stage, grabs the mic from Taylor, and basically disses Taylor by saying something along the lines of "Taylor's video is good but Beyonce's was one of the best ever" or something assholish like that. He proceeded by being booed by the crowd, almost making Taylor cry (she didn't get to finish her speech at the time and thank everyone), and pissing off fans around the world.
Thankfully, Beyonce was a sweetheart and called Taylor up to the stage later and let her finally give her speech :)
The main thing that outraged people is that he interrupted her acceptance speech, cut her off, and trashed her when it was HER moment!