Maybe in the fanfiction, Naruto has made some decisions that go against Hinata's beliefs or values. Suppose Naruto decides to use a very dangerous and unethical jutsu for power, and Hinata, who is usually very moral, might start to hate him for that.
It could also be that the author wants to add some drama. Hinata's love for Naruto is so well - known in the original story. By making her hate him in the fanfiction, it creates a huge contrast and a lot of potential for emotional turmoil, arguments, and different character developments.
Maybe in that fanfiction, Naruto's over - eagerness to be recognized could be misconstrued. His loud and boisterous nature might annoy people. For example, if he constantly interrupted others or pushed his ideas too hard without considering others' feelings, it could lead to dislike.
One reason could be that some fans might be disappointed with certain aspects of the original Naruto series. For example, the development of some characters might not meet their expectations. So, they create fanfiction to express their negative feelings.
In terms of the story's plot, it could lead to Naruto trying to redeem himself in Hinata's eyes. This could involve him going on dangerous quests or changing his ways. It also might make Naruto more isolated as he loses one of the people who used to care about him, which could in turn lead to a change in his relationships with other characters like Sasuke or Sakura.
One possible reason could be misunderstandings. Naruto is a bit of an outcast at first, and his brash personality can be misinterpreted. In fanfiction, the team may misjudge his actions as being self - centered when in fact he's just trying to prove himself. This could lead to them hating him.
One possible reason could be the difference in power systems. Naruto's world has its own unique ninja abilities like jutsus, while Fairy Tail has magic. In some fanfictions, the clash of these two different power concepts might make Fairy Tail fans dislike Naruto being involved. Maybe they think Naruto's abilities are too overpowered or not in line with the magic - based universe of Fairy Tail.
Another reason could be in a fan - created scenario where there are secrets involved. Hinata might be keeping a secret from Naruto that, when revealed, makes Naruto feel betrayed or deceived. This sense of betrayal could easily turn into anger. For instance, if Hinata has a connection to an enemy that she's been hiding from Naruto.
One possible reason could be for the sake of creating a more complex love triangle in fanfiction. Maybe the writer wants to explore a different dynamic where Naruto and Hinata's relationship is strengthened by having a common dislike for Sakura. It could also be that the fanfiction writer is trying to give Hinata more agency and make her a stronger character by having her oppose Sakura in some way, perhaps in matters related to Naruto's affections.
Some people create such fanfiction maybe because they like to explore alternative or dark storylines. They might think it's interesting to deviate from the canon relationship between Naruto and Hinata.
It could be due to jealousy. Some villagers might be jealous of Naruto's power and Hinata's noble status. So, they spread false rumors that lead to their banishment.
Stuttering is often used to show their nervousness. Naruto, who is usually confident, stuttering around Hinata can show his deeper feelings for her that he might not be fully aware of or know how to express. For Hinata, it emphasizes her shy nature.