I don't think Anri deserves so much hate.
Yes she's sometimes bitchy with Hana, but I don't feel some true wickedness from her, it's more the kind of words you let burst out of anxiety and anger. And she realizes it herself.
For such a spoiled teenage girl, she doesn't behave that much as a princess either.
Still, i'm rooting for Hana, Anri gives Aoi good football advices, but Hana is the only one able to calm him down and make him focus, that's exactly what he needs in his life.