It could create a rift within the overall story's world. Fans who love Naruto might not like this portrayal, which could lead to a divide among the fan base. Also, other characters in the story might have to take sides, either with Naruto or with the team that hates him, causing more conflict and drama within the fanfiction.
Another reason might be related to a past event that Naruto unknowingly caused harm to one of the Team 7 members' families. Even if it was an accident, the emotional pain could make the affected member, and maybe the whole team, hold a grudge against Naruto. For instance, if Naruto's actions during a battle led to the destruction of a family's home, and a Team 7 member was from that family.
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.
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.
There could be a big divide within the village. Some villagers might feel guilty and try to make amends, while others might be defensive. This could lead to internal conflict. The village elders might also have to take steps to reform the village's social structure to prevent such abuse from happening again.
He might miss out on some creative and interesting interpretations of the team dynamics. There could be some really well - written team fanfictions that he'll never get to enjoy.
One possible consequence could be that his identity is revealed. If he was using the henge for undercover purposes or to hide his true self, then dropping it would expose him. His friends or allies might be shocked if they didn't know his true form. Another consequence could be that his enemies might take advantage of his revealed state and attack him more easily, as they now know exactly who he is.
It might also cause Naruto to lose control more easily. If he hears such a hurtful term from someone he cares about like Sakura, it could make him more vulnerable to the Nine - Tails' influence. In the long run, it could be a turning point in his character development, either making him more bitter or more determined to show everyone, including Sakura, that he's not what she says.
One possible reason could be a very different and perhaps unappealing take on Naruto's character in that fanfiction. Maybe the author made him overly cruel or out of character in ways that fans who love the original Naruto can't stand.
He might face more difficulties in fighting powerful villains. Without a team to back him up, he has to take on all the challenges alone. This could lead to him getting injured more often or having a harder time achieving victory.
The Akatsuki might take advantage of the situation. With Naruto gone, there's no one to oppose them as strongly. They could start making bolder moves, attacking villages more openly. The other villages might also see Konoha as a threat since one of their own teams killed their most powerful ninja. This could lead to all - out wars between the villages, changing the entire political and power structure of the fanfiction's ninja world.