I don't get the hate that always existed for him. Granted the hate is more deserved since his heel turn, but people were hating on him before that. There will always be marginally talented pretty boys making music for tween girls. Deal with it. No need to loudly proclaim how much you hate his music.
But that hate is an integral part of the cultural ritual of celebrity; it is as important, if not more important than, the music itself! There will always be people loudly proclaiming how much they hate marginally talented pretty boys making music for tween girls.
But you don't have to deal with it, because people loudly proclaiming how much they hate people loudly proclaiming how much they hate marginally talented pretty boys making music for tween girls, is a vital part of the ritual, too!
Disavowing superficial Pop Music is part of growing up. When you're a kid, the music that you listen to is incredibly important. My first real girlfriend had a "Disco Sucks" T-Shirt. I can remember discussing it with her, and how ridiculously serious we were about it. God, we were assholes!
The hate Bieber gets is the low-hanging fruit of the acceptable humour tree. Everyone can do it, nobody objects to the joke (I mean, I do, but whatever), and it always seems to get a laugh. People don't so much hate Bieber as they hate having to think of something interesting to say.