Do you think it's fair to hate Justin Bieber?

I can understand people not being a fan of his music, or not being a fan of the way he dresses or talks, but i really can't understand people straight up hating him? he's seems quite nice, and he does a lot of charity work, and all he's trying to do is have a music career. i don't quite understand the need for hate? Do you think it's fair how some people speak so hatefully and rudely about him?