Fanfiction often takes creative liberties. So, the author might have written Annabeth as having a personality trait that directly opposes what Hermione values. For example, if Annabeth is portrayed as being dismissive of books and knowledge, which are very important to Hermione, it would make sense for Hermione to hate her.
It might be due to cultural differences. Hermione comes from the wizarding world, and Annabeth from the demigod world. In fanfiction, these differences could be exaggerated, and Hermione might find Annabeth's 'alien' culture off - putting or difficult to understand, leading to dislike.
It's possible that Harry hates it because he has a certain image of Ron and Hermione in his mind. Fanfiction can sometimes create versions of them that are completely different from what he knows. For example, some fanfiction might focus on a love triangle that he doesn't think exists in their real relationship. This divergence from his perception could lead to his dislike.
One possible reason could be a misinterpretation of their relationships. Maybe the author wants to explore a different dynamic where Harry and Hermione bond over Ron's perceived flaws, like his occasional laziness or his insecurities that might come across as annoying to them in this fictional scenario.
Some people might just want to explore alternative scenarios for the sake of creativity. They may think it's interesting to see how the story would unfold if there was animosity between them.
Well, in some fanfictions, it could be that they're under the influence of some dark magic or a spell that makes them turn against Hermione. Or perhaps they're misinformed about her actions at Hogwarts and think she's a bad influence. Also, some writers might use it as a plot device to create a rift and then build a story around Hermione trying to fix things with her parents.
Well, it could be because Hermione did something that Annabeth considered a betrayal in the context of the fanfic. Maybe she broke a pact or made a decision that went against Annabeth's plans.
One reason could be that some fans are very purist about the original Naruto story. They might feel that fanfiction often distorts the characters or the plot in ways that go against the essence of what Naruto is all about. For example, changing a character's personality completely to fit a romantic or dark and edgy narrative that doesn't align with the source material.
One reason could be their different areas of expertise. Annabeth is highly skilled in architecture and battle strategies in the Percy Jackson world. Hermione, being a brilliant witch in the Harry Potter universe, might feel jealous if she perceives Annabeth as having more practical and hands - on skills. Another factor could be their relationships. If Annabeth has a really great relationship with someone Hermione admires or wishes to be closer to, it could stir up jealousy. For example, if they were in a shared universe and Annabeth was closer to Harry or Ron than Hermione was.
He might dislike it because it can create false expectations. Fans read fanfiction and might start expecting the real Avengers to act in a certain way that is not in line with their true nature.
One possible reason is that yoh might find the creativity in human fanfiction to be unoriginal. A lot of fanfiction tends to follow similar patterns or tropes, and yoh could be tired of seeing the same old ideas recycled over and over again.
Another possibility is that he doesn't like how some fanfictions over - sexualize the characters. In some cases, fanfiction can turn into something inappropriate, and Harry, who has a more pure view of his friends and the wizarding world in general, would be disgusted by this. He wants to preserve the integrity of the relationships and the world as he knows it.