It's hurtful to prevent someone from winning an award.
Kanye is in the audience at the Grammy's while Taylor's name is being announced as the winner of a category.
Kanye wants to react to Taylor winning a Grammy.
Kanye stands up and begins to clap loudly, whistling and cheering for Taylor's win.
Kanye runs up on stage and grabs the microphone saying that someone else should have won.
Taylor is honored that Kanye would be so happy for her to win as she can see him cheering from the audience.
Taylor is disgusted that Kanye is ruining her moment and that she cannot accept the award because his ego won't let her.