Some people write 'kakashi sakura hate fanfic' because they simply don't like the character dynamic between them in the original work. Maybe they think Sakura is too whiny or that Kakashi is too aloof towards her, and they want to explore a more negative version of their relationship.
Some people hate Facebook stories because they can be very intrusive. They pop up and take over your screen without much warning. Also, they often show a lot of content that might not be relevant to the user, like sponsored stories or updates from people you're not really interested in.
Well, Comic Sans is often seen as childish and not suitable for many formal or important contexts. Its design is kind of goofy and doesn't have a polished look.
Some people might hate visual novels because they find the gameplay or interaction limited. Maybe they prefer more active or challenging forms of entertainment.
Well, Comic Sans is considered overused and doesn't fit many contexts. It's too casual for formal stuff and doesn't have a modern aesthetic. Also, some people just think it's plain ugly!
Some might hate Pokemon fanfiction because they prefer the official canon. They feel that fanfiction often deviates from the original storylines, characters' personalities, and the overall world - building of Pokemon. It can be jarring for those who have a strong attachment to the official version.
Some people might hate romance novels because they find the plots overly predictable. It's always the same story of two people meeting, having some misunderstandings, and then getting together in the end.
Another reason could be that some fans are purists. They only want to experience Pokemon through the official games, anime, and merchandise. Fanfic, in their eyes, is like an unauthorised and perhaps 'impure' form of Pokemon media. They might see it as something that dilutes the essence of what Pokemon is supposed to be.