It could be that he has seen some really bad magic fanfiction. Some fanfiction might misinterpret the characters or the magic system in the Harry Potter world, which annoys him.
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.
Well, Harry Potter has been through so much in his own story. Fanfiction could be seen as a misrepresentation of his life and the world of magic he's a part of. It might rewrite his relationships or the significance of certain events, and he doesn't like that kind of false portrayal.
Well, it could be that he has seen some really bad magic fanfic. Some fanfic might be full of inaccuracies about magic, and as someone who has a deep connection to magic, it annoys him. For example, if a fanfic misrepresents a spell or a magical creature that he is familiar with, it would make him dislike it.
Maybe in that fanfic, Harry has had some really bad experiences with magic that made him hate it. For example, he could have seen magic being misused to harm innocent people. Or perhaps he's tired of the chaos and danger that magic always seems to bring into his life in the fanfic.
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 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.
Maybe in the fanfiction, the Order has some actions that Harry disagrees with. For example, they might be too controlling over his life and decisions. Harry is a very independent person, and if the Order tries to restrict his freedom in the story, it could lead to his hatred.