There are probably many 'kakashi sakura hate fanfic' out there, but I haven't really delved into them much. Some might be based on shipping wars, where fans of other pairings write negative things about Sakura in relation to Kakashi. They might write scenarios where Kakashi dislikes Sakura because she gets in the way of his relationship with another character in the fic, which is really just a way for the writer to push their preferred ship.
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.
Maybe he thinks fanfic often distorts the real story or characters of Naruto. In the original Naruto series, Kakashi has his own understanding and relationship with Naruto. Fanfic might create some scenarios that go against his view of Naruto or the world they live in.
If we consider the concept of Sakura 'in heat' in a non - inappropriate way, perhaps it could symbolize a period of intense emotion or a turning point in her character arc within the fanfic. It could be that she becomes more determined or passionate about something related to Kakashi, like her ninja skills or their relationship.
One great Kakashi and Sakura soulmate fanfic is 'The Unseen Bond'. It beautifully explores how their relationship could develop in a soulmate context. The story delves into their individual insecurities and how they overcome them together as soulmates. The author does an amazing job of portraying their growth and the unique connection they share.
Perhaps he thinks fanfic undermines the integrity of the original Naruto story. The official story has a certain narrative and character development, and fanfic can deviate from that significantly. When it comes to his connection with Naruto, any deviation in fanfic might be seen as a negative. For example, if a fanfic changes the way he mentors Naruto, it could be something he wouldn't like.
Maybe Karin has some personal reasons. For example, she might not like Sakura's character in the original work, so she also dislikes fanfic related to Sakura.
Well, it could be that in certain fanfics, the writers want to create a more complex and angsty story. Sasuke's character is often seen as a brooding and driven one. So, they make him hate Sakura perhaps because they think it adds an interesting dynamic. For example, if Sakura is constantly trying to get close to him but he hates her, it can lead to a lot of conflict and emotional turmoil in the story.
Maybe in the fanfic, Itachi has done something that goes against Sakura's beliefs or values. For example, he might have made a decision that put her friends in danger.
Well, in fanfic, the writer can take creative liberties. It could be that Naruto has grown and evolved in a different way than in the original story. He might have seen Sakura's flaws more clearly over time. For example, her obsession with Sasuke could be seen as a negative trait that affects the team dynamic. And as Naruto values the team highly, this could cause him to develop a dislike and eventually hate for Sakura.