In some fanfictions, Jacob might hate Bella because of the love triangle situation. He could feel that Bella has led him on or toyed with his emotions. For example, if she constantly goes back and forth between him and Edward, it can make Jacob bitter and resentful towards her.
It could also be due to miscommunication. Fanfiction often plays with misunderstandings. Perhaps there was a situation where Bella's actions were misinterpreted by Jacob. For instance, if she was trying to protect him but he thought she was betraying him, this could plant the seeds of hatred in Jacob's heart.
In some fanfiction, Bella might hate Jacob because of his over - protectiveness. He can be very possessive and that could make Bella feel suffocated, leading to dislike.
In fanfiction, Bella could hate Jacob's imprint because it represents a change that she doesn't want to accept. She might have been used to Jacob having a certain kind of love for her, and the imprint is like a sudden shift. It might also be related to the fact that the imprint might lead Jacob to be involved with someone else in a very intense way, and Bella, who has her own complex feelings for Jacob, doesn't like this new development.
Well, in some fanfictions, Hermione might hate Bella because their personalities are so different. Hermione is studious, logical, and a fighter for justice. Bella, on the other hand, is often portrayed as more passive and overly focused on her romantic relationships. Their different values and ways of approaching life could lead to Hermione's dislike of her in fanfiction.
Well, it could be that Paul has a different vision of the story's original plot and the fanfiction of Bella goes against that. He might be a purist when it comes to the original story and detest any deviation in the form of fan - made fiction about Bella.
Maybe Elena just doesn't like the way Bella is portrayed in fanfiction. It could be that she has a different view of the original Bella character and the fan - made versions deviate too much from it.
Another reason could be the influence of other characters. There might be a new character in the fanfiction who convinces Bella that Edward is not who she thought he was. This new character could plant seeds of doubt in Bella's mind about Edward's intentions and actions, ultimately resulting in her hatred.
It could be that in the fanfiction world, Bella's mother has made some bad decisions in the past that directly affected Bella negatively. Perhaps she abandoned Bella at a crucial time, which led to Bella's hatred.
It could be because of a misunderstanding. Perhaps there was a miscommunication or an incident where the sister was wrongly blamed for something, and Bella held onto that grudge. Say the sister accidentally broke Bella's favorite item but Bella thought it was done on purpose, which then festered into hatred in the fanfiction world.
Well, it could be that in the fanfic's storyline, Bella has had some bad experiences in the past related to intimacy. Maybe she was betrayed or hurt, which made her develop this hatred.
In some fanfictions, the Cullens might hate Bella because of jealousy. Maybe other vampires are jealous of the attention she gets from Edward. Another reason could be that she brings too much danger to their family. Her presence could attract unwanted attention from other vampires or vampire hunters, which puts the Cullens at risk.