Perhaps in this fanfiction, the author has imagined a completely different backstory for Harry. Maybe he was somehow mistreated by humans in this alternate story from a very young age. This continuous abuse or neglect could lead to him hating humans. But in the official Potterverse, Harry is a symbol of love and hope and friendship among humans, so this is a huge deviation. It could also be that the writer is exploring some complex psychological concepts by making Harry hate humans, like the effect of long - term isolation or extreme trauma on a person's view of humanity.
One possible reason could be the betrayal he faced from some people in the wizarding world. For example, some students at Hogwarts might have spread false rumors about him or treated him unfairly because of his fame as 'The Boy Who Lived'. This could have led him to develop a general dislike for humans.
One possible reason could be a divergence in the characters' personalities as portrayed in the fanfiction. Maybe the writer made Molly have traits that Harry would realistically dislike. For example, if Molly was written as overly controlling or mean-spirited towards Harry in the fanfic.
Well, it could be that the two come from very different fictional universes with distinct magic systems and cultures. Harry Potter's world is based on a more European wizarding society, while Odin is from Norse mythology. Their values and the way magic works might clash in the mind of the fanfiction writer, leading to this 'hate' concept.
One possible reason could be a personality clash. Harry might have a very different personality from his mother. He could be more adventurous and she might be overprotective, which could lead to resentment on his part. Fanfiction often takes the characters and twists their relationships in unexpected ways.
One reason could be secrecy. If Harry finds out that Dumbledore has been keeping major secrets from him all along, like about his family or his true role in the wizarding world, he might start to hate him. Another reason could be manipulation. If it seems that Dumbledore has been manipulating Harry's actions for his own gain, that would be a valid cause for hatred in fanfiction.
In this fanfiction, perhaps there's some miscommunication. Maybe the Weasleys' boisterous nature is misconstrued by Harry. For example, their large family dynamic might be overwhelming to him at times, which could be a reason for the 'hate' in the fanfic.
One possible plot could be that Harry has been repeatedly betrayed by those he trusted, all of whom are humans. This string of betrayals causes him to gradually develop a hatred for all humans. He might then go on a journey to isolate himself from human society and seek revenge on those who wronged him.
One possible reason could be that the fanfiction misrepresents the Uzumaki clan or Naruto's connection to it. Naruto has a deep and complex relationship with his Uzumaki heritage, and if the fanfiction distorts it, he might dislike it.
One possible reason could be that the fanfiction misrepresents Sakura's character. Maybe it portrays her in a way that she would never act in the original context of the series, which makes her seem out of character and thus causes dislike. Another reason might be that the fanfiction focuses too much on other members of Team 7 and sidelines Sakura, making her seem less important or relevant than she actually is in the story.
Well, one reason could be that fanfiction often takes creative liberties that might distort the original relationship between Poseidon and Percy in the official story. It could be that Poseidon is a very complex character in the original, and fanfiction simplifies or misrepresents him in a way that makes it seem like he 'hates' Percy in those fictional interpretations.