He might hate it because it can create false expectations among the readers. The wizarding world has its own set of rules and history. Fanfiction sometimes bends these rules too much. Harry is used to the real, complex and sometimes harsh world of magic. Fanfiction might simplify it or make it overly dramatic in ways that he finds annoying.
Maybe he thinks it distorts the real story of the wizarding world he knows. Fanfictions often take creative liberties that might go against his own experiences and the original narrative.
One reason could be that he values the authenticity of the wizarding world he lived in, and fanfiction often strays from that.
It could be that Harry has faced so many challenges in the fanfiction that he's simply burnt out. Just like in real life, if a person endures too much stress or hardship, they might want to step away. In the fanfiction, Harry may have reached his limit of what he can handle in the wizarding world.
Perhaps in certain fanfiction scenarios, Naruto discovers some dark secrets about the shinobi world that make him lose faith in it. Like the hidden political machinations that sacrifice the innocent. This realization could make him hate the world he once fought to protect.
Maybe in the fanfiction, Susan has some actions or traits that Harry doesn't like. For example, she could be really self - centered and always puts her own needs before others. This might make Harry, who perhaps values kindness and selflessness, to hate her.
Maybe he just doesn't like how some fanfictions distort his real experiences in Gryffindor. He might feel that they don't accurately represent his relationships with his housemates or the true nature of the Gryffindor house.
Maybe he has his own idea of what the real magic world should be like. Fanfiction often twists and changes the original story in ways he doesn't like.
Maybe he hates it because it often distorts the original story. Fanfictions might create out - of - character versions of wizards, and Harry, who has a deep connection to the real story and characters, can't stand such misinterpretations.
In fanfiction, it could be that the writer wanted to create a new and different dynamic. Harry could hate Remus if there was a love triangle situation involving someone Harry cared about and Remus. For example, if Remus started dating Harry's mother figure in the fanfic world, it could lead to Harry hating him.
In some fanfiction, Harry might be written to hate Sirius due to misunderstandings. For example, if a writer wants to create drama, they could make Sirius do something that Harry misinterprets. Maybe Sirius makes a decision about Harry's future without consulting him first, leading Harry to feel angry and resentful.
In some fanfictions, the author might want to explore a different dynamic between the characters. If the fanfiction is set in an alternate universe where James has different values or actions compared to the original story, Harry might hate him. For instance, if James is part of a group that opposes Harry's ideals, it would be a reason for Harry to dislike him.