Maybe they have a different taste in literature. They might prefer other types of stories and not be into the fanfiction genre, especially those related to Percy and Annabeth.
In How Steel Was Tempered, why did Paul hate a young master so much? Because that young master was a playboy who liked socializing like a social butterfly. He often had sex everywhere and often regarded Paul as his plaything. In addition, the young master often used Paul's status and resources to pursue his own interests instead of really caring about Paul's actual needs, which made Paul very disappointed and dissatisfied. In addition, the actions and verbal attacks of the young master made Paul even more determined to leave this circle.
Well, in some fanfictions, Sirius might be depicted as hating Hermione due to misunderstandings. Maybe he misunderstands her intentions or actions. For example, if Hermione is shown as being too strict with the rules in a story, Sirius, who has a rebellious streak, could resent that.
In the fanfiction, perhaps there are misunderstandings between Percy and Calypso. Maybe she blames Percy for things he didn't do or vice versa. These constant misunderstandings can lead to Percy hating her.
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.
Maybe Ash hates Pokemon fanfiction because it often goes against the official storylines and characterizations he is used to in the real Pokemon world. Fanfiction might distort the relationships between characters or create out - of - character situations for him.
Some people might hate Pokemon fanfiction because they prefer to stick to the official Pokemon storylines and characters as created by the original developers. Fanfiction often takes creative liberties that can deviate significantly from what they consider to be the 'true' Pokemon universe.
Maybe he finds them too obsessive. In fanfics, fangirls might be portrayed as constantly crowding him, not respecting his personal space, and only being interested in his looks or status as a hero. This could make Naruto, who values real connections and his own growth, dislike such fangirls.
Spike might hate Twilight fanfiction because he doesn't like the way some writers take creative liberties. He may think that they are misinterpreting Twilight's essence. In many fanfictions, the relationships and events are twisted, and Spike, being close to Twilight, might feel protective of her true nature and thus dislike these fictional interpretations.
Maybe he has some personal beliefs or values that conflict with the typical themes in heroine novels. For example, he might dislike the often overly romanticized or damsel - in - distress portrayals in those novels.