Perhaps they are simply not interested in the idea of fan - created content in general. They may think that if they want to experience Pokemon stories, they should look to the official sources such as the games, the anime, or the official manga. Fanfiction, to them, is just an unnecessary addition that they don't want to engage with.
One possible reason is that the person may find the fan - made interpretations of the Pokemon world too far - fetched. For example, some fanfictions might give Pokemon abilities that are completely against the established rules in the official games or anime. This can be off - putting to those who like the consistency of the official lore.
One possible reason could be jealousy. Maybe in the fanfiction, Jiraiya gives more attention to another character, and Naruto, being young and impulsive, starts to hate him for it.
Perhaps he has seen fanfiction that contains inaccurate information about the Naruto universe, such as wrong jutsu descriptions or incorrect interpretations of the ninja clans. This would make him dislike it as he is an educator in the Naruto world and has a certain standard for knowledge about it.
One possible reason is that the fanfiction distorts the original relationship between Bella and Sam in a way she finds unacceptable. For instance, if it creates a false romantic tension where there shouldn't be one.
It could also be that in the fanfiction, Percy is given a new power or ability that Annabeth sees as a threat. Or perhaps Percy is made to side with someone Annabeth dislikes, causing her to 'hate' him in that fan - created story. This shows how different plot elements in fanfiction can change the dynamics between characters.
It might be that in the fanfiction, Calypso represents something that Percy has come to dislike. Maybe she is associated with a force or an idea that Percy opposes, like a form of confinement if she tries to keep him on the island in a more extreme way than in the original tales.
One reason could be that she doesn't like how others are taking creative liberties with their relationship in the fanfiction. It's like someone else is trying to rewrite a story that she feels is special to her in a way that she doesn't approve of. Another possibility is that she simply doesn't like the idea of fictionalized versions of their relationship floating around, as it might seem disrespectful to her real - life experiences with Ash.
It might be related to power dynamics. If in the fanfiction, James has a lot of power and misuses it in a way that affects Harry or those around him, Harry would hate him. For example, if James uses his influence to push through unfair rules or to marginalize certain groups that Harry supports. Also, if the fanfiction changes James's personality to be more self - centered and less empathetic, Harry would likely dislike him.
In fanfiction, the politics and intrigues within Olympus might be depicted in a way that makes Percy disgusted. The backstabbing and power - hungry nature of some of the Olympians could be too much for him to bear, so he hates Olympus.
Perhaps the fanfiction is set in an alternate universe where something has happened to change Percy's feelings towards Annabeth. For example, if there was a betrayal in the fan - created story that made Percy turn against her.
One possible reason is the pacing. The movie has a slow - burn kind of pacing in some parts, which might not be to everyone's taste. If you prefer fast - paced action or a more straightforward plot progression, Pulp Fiction's pacing could be a turn - off.