Perhaps she just doesn't like the idea of people taking creative liberties with her story. She might be a very private character in her own mind, and fanfics are like an invasion of that privacy.
It's possible that she dislikes the quality of some Hiccup fanfics. If a lot of them are poorly written or full of clichés, it could turn her off. For instance, if every fanfic has the same overused plot lines about their love story, she might get tired of it and develop a dislike for all Hiccup fanfics.
One reason could be that the fanfic changes the essence of their relationship. In the original, they have a certain dynamic that she values, and fanfics might mess it up.
Hiccup's over - confidence could also make Astrid mad. If he goes into a dangerous situation without proper preparation, thinking he can handle it because of his previous experiences, and then things go wrong. Astrid, who believes in careful planning, would not be happy with his reckless behavior.
Perhaps for shock value. Some writers might think that creating a very controversial and unexpected plot would draw attention.
In some fanfics, there could be a misunderstanding. Suppose Kushina did something that Naruto misinterpreted as harmful to him or his friends. This misinterpretation could lead to his hatred. For example, if Kushina was involved in a mission that Naruto thought put the village at risk, but in reality, she had no choice.
One reason could be jealousy. Maybe in the fanfic, Annabeth gets more attention or praise for her skills and Percy feels left out or overshadowed, which turns into hatred. Another possibility is that there's a rift caused by their different approaches to solving problems. If Annabeth's logical thinking clashes too much with Percy's more instinctive ways, it could lead to resentment.
One possible reason is that their personalities clash. Percy is often portrayed as a more outgoing and confident character, while Nico is more introverted and brooding. In a fanfic, this could lead to misunderstandings and animosity between them. For instance, Percy's bold actions might seem reckless to Nico, causing him to dislike Percy.
Another possibility is that she is protective of her relationship with Sonic. Fanfic might introduce elements that she feels are inappropriate or could potentially damage the 'purity' of what she has with Sonic. It's like she wants to safeguard the special bond they share in the official narrative from being sullied by unapproved fan - created stories.
One reason could be a personal betrayal. Maybe a close friend from Gryffindor betrays Harry, and this makes him start to dislike the whole house. It's like when one bad apple spoils the bunch in his eyes.
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 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.
Maybe they don't like the slow - paced nature of the movie. It takes its time to build up the story and the Christmas atmosphere, which can be a turn - off for those who like fast - paced action.