I don't really hate anyone per se but Taylor Swift's idiotic fans make me want to hate her (if you're a Swift fan and you're not a dumbass, don't worry, this doesn't apply to you ). Her VMA performance certainly didn't help.
The only celebrities i really hate are Taylor Swift and We Are The Fallen. I hate them both for different reasons. But i hate We Are The Fallen a lot more.
:P
i'm not nuts about Bieber or Miley either. but i don't hate either of them. :P
EDIT: Wow. i overused the word "hate" in this post. XD
but honestly. i don't think any of us can possibly "hate" artists. i think strongly disliking their music or things they do is a different thing.
hate is a strong word... of course i don't hate her, i don't even know her. All the other people in this thread hate the ones they listed? It's just about the artist not the person, so there cannot be hate.