A possible reason could be jealousy. If Naruto had a sibling who was always favored by their parents, he might grow to hate his family. He would feel like he was always in the shadow of his sibling and that his family didn't care about him as much.
Maybe in some love fanfictions, the writers distort the original family relationships in Naruto's story. They might create untrue or negative scenarios about his family, which makes Naruto seem to 'hate' his family in those fictional settings.
One possible reason could be that he discovers some long - hidden family secrets that make him feel betrayed. For example, if he finds out that his family was involved in something unethical in the past. Another reason might be that he feels constantly overshadowed by his family's legacy and can't form his own identity within the family, so he decides to leave to find himself.
Another reason might be related to family politics. In some complex family structures in the Naruto universe, there could be different factions. Naruto might be on the wrong side of the power struggle within the family. His views or actions could be seen as a threat to the traditional power structure of the family, so they hate him.
It could also be due to differences in values. If Dark Naruto had different beliefs about power, friendship, or loyalty compared to his family, and they constantly clashed over these, it might lead to his hatred. For instance, if his family adhered strictly to Konoha's traditional values but he saw them as restrictive.
One possible reason could be a misunderstanding. Maybe some false information was spread about his mother, making Naruto believe she had abandoned him. Another reason could be related to the secrecy around his mother. If he grew up feeling alone and not knowing about her, he might develop resentment.
In some fanfictions, Naruto might be made to hate his mother because of a misinterpreted prophecy or a false belief that she abandoned him. Maybe the author wants to create a more complex and angsty story line for Naruto.
No, in the official story, Boruto loves his family deeply. However, in certain fan - made stories, writers might deviate from this fact for the sake of drama or exploring different character dynamics. But this is just a fictional interpretation within a small subset of fanfiction, not the overall truth about Boruto.
It could also be due to a lack of support. Naruto was constantly in trouble and trying to prove himself. If his family didn't show up in any way to support him and Konoha didn't do enough to encourage him in a positive way, but rather just punished him for his pranks, he might grow to hate them both.
The reaction of the Naruto fandom would be one of disgust and disappointment. Fans have grown to love Naruto for his kind heart, his loyalty, and his search for family and belonging. A fanfiction with such a dark and untrue plot would be seen as a perversion of the Naruto we all know. It would go against the community's shared understanding of the character and the values the series represents. Some fans might even try to discourage the spread of such a fanfiction to protect the integrity of the Naruto fandom.