Well, this kind of fanfiction might be an interesting take on the character. It could explore a darker side of Harry Potter that we don't often see in the original series. Maybe the author wants to show how all the pressure and trauma he has endured could lead to a more cynical view of those around him.
Yes, there probably is some amount of it. However, in the official books, Hermione and Harry have a very strong bond. They support each other through countless challenges. Fanfiction like this may explore alternative character dynamics, but it's not the mainstream view of their relationship.
Yes, there are quite a few out there. Some explore the reasons behind Snape's possible dislike for Hermione from his perspective of being a strict teacher and having his own biases. However, not all of them are well - written. You might have to dig through a lot of stories on fanfiction platforms to find the really engaging ones.
In some fanfictions, the world - building or the plot might force a rift between them. If the story is set in a situation where resources are scarce and they have different ways of handling it. Hermione's more logical and rule - based approach might clash with Annabeth's more instinct - based approach, leading to Hermione hating her.
Well, in some RWBY fanfiction, the 'everyone hates Jaune' trope might be used to create drama. Maybe the author wants to explore how Jaune would grow and overcome such extreme dislike from others. It could also be a way to put him in difficult situations for character development.
Perhaps in this fanfiction, Naruto discovers some dark secrets about the village. Secrets that make him feel like he's been used all along. Like the village was only using him as a weapon against their enemies. This realization could make him resent everyone in the village, thus hating everyone.
Well, it could be that Percy has had some really bad experiences in his life that made him bitter towards everyone. Maybe he was betrayed by friends in the past, so now he just can't bring himself to trust or like anyone.
She could also engage with the fanfiction community and share her views. Maybe by expressing what she doesn't like about the current Hermione fanfiction, some writers might take her ideas into account and create something more to her taste.
He could also try writing his own fanfiction. By creating his own version, he might gain a new perspective on Hermione fanfiction and perhaps even start to like it. Or he could engage in discussions with fanfiction writers to understand their intentions better.
Some writers might create such fanfiction for the shock value. They want to break the established strong friendship in the original series to get readers' attention.