Yes, there probably is some amount of it. However, in the official books, Hermione and Harry have a very strong bond. They support each other through countless challenges. Fanfiction like this may explore alternative character dynamics, but it's not the mainstream view of their relationship.
Yes. In the Harry Potter universe, the concept of hating 'mudbloods' is a form of bigotry. The original series promotes love, acceptance, and the fight against discrimination. A fanfiction with this title seems to go against the core values of the series.
Well, this kind of fanfiction might be an interesting take on the character. It could explore a darker side of Harry Potter that we don't often see in the original series. Maybe the author wants to show how all the pressure and trauma he has endured could lead to a more cynical view of those around him.
It could be for the sake of exploring an alternate personality for Harry. Writers might want to see how the story would change if Harry had a negative view of Muggles. Maybe they're exploring a darker side of the wizarding world where such prejudices exist among the main characters.
One reason could be a divergence from the original friendship dynamic in the books. In the canon, Harry and Ron are good friends, and fanfiction that shows Harry hating Ron might go against what many fans consider the essence of their relationship.
Perhaps in the 'harry hates dunbledore fanfiction', Dumbledore is shown as being involved in some sort of secret plot that goes against Harry's values. For example, if Dumbledore was secretly working with the dark side in the fanfiction, Harry would naturally hate him. Also, it could be that Harry has discovered some long - hidden truth about Dumbledore that completely changes his view of him, like a past misdeed that Dumbledore has covered up.
I'm not sure of a specific 'Harry hates needles' fanfiction off - hand. But you could start by looking on fanfiction platforms like Fanfiction.net or Archive of Our Own. Search for tags like 'Harry Potter' and 'hates needles' to narrow down the results.
The theme of disillusionment also often appears. Harry, who once idolized Dumbledore, now sees him in a new light. He realizes that Dumbledore is not the perfect mentor he once thought, and this realization leads to his hatred. This can be explored in various ways, such as through flashbacks or interactions with other characters who have different views of Dumbledore.
Well, it could be that the fanfiction is trying to show Ginny's jealousy or resentment in a new light. Perhaps she's jealous of Harry's fame or the attention he gets. Or maybe the writer is simply exploring a 'what if' scenario where Ginny and Harry's relationship took a different turn from the start. In the original story, they end up together, but fanfiction allows for alternative storylines, and this could be one of them where Ginny hates Harry for various reasons that might be related to their different personalities, goals or the pressure of the wizarding world around them.