I've come up with some reasons why I think haters hate on her (not in any particular order) just from observing them. Before I got into ayu I used to be #1, #3, and #5.
But, even if they feel any of these things I still don't see why some have to take things too far and say extremely horrible things about her. I think if some of them just took the time to read one of her interviews or any of her lyrics they'd at least develop some respect for her. But then again, some have hate that is way too strong and their minds can't be changed.