One consequence could be that it divides the fan community. Fans who like Jason might not appreciate Percy being portrayed as hating him, and vice versa. This could lead to arguments and a split in the fandom.
One possible consequence is that it could lead to a split in their group. If they are part of a team or a community, their animosity could cause others to take sides, creating factions.
One consequence could be that he might face social isolation in certain situations. For example, in a party or gathering where alcohol is the main feature, Percy would be the odd one out, which could lead to him being excluded from certain social circles within the fanfiction.
One consequence could be a rift in the family. Their relationship might be so strained that it affects the whole family dynamic, causing tension during family gatherings or events.
One consequence could be that Percy becomes more rebellious. He might not follow the gods' orders as readily as before, which could lead to all kinds of chaos in the world of the story.
His relationship with Jiraiya could be affected. Jiraiya has a strong connection with the toads, and if Naruto hates toads, it could create a rift between him and his mentor. This could lead to Naruto losing an important source of guidance and support in the fanfiction.
One consequence could be that he leaves the village. He might go off on his own to find a new place where he feels accepted and can start anew.
It could also lead to some division among the Naruto fandom. Those who support Sakura's view might be more critical of fanfiction, while those who love fanfiction might not like Sakura as much because of her stance. For example, in online Naruto communities, there could be debates and arguments about whether Sakura is right to hate fanfiction.
One consequence could be that Harry becomes more isolated. If he hates the Order, he may distance himself from them, which means he loses a group of potential allies. This could put him in a more vulnerable position in the wizarding world.
The hatred between them might also have an impact on the relationships they have with other gods. Other gods may be forced to try and mediate or choose sides as well. This can cause a shift in the power dynamics among the gods in the fanfiction world, creating new storylines and plot twists.
One possible consequence could be that his relationships with other characters who are related to the Uzamaki clan, like Hinata (since she marries into the Uzamaki family), become strained. It might also lead to internal conflict within himself as he battles with his own identity and heritage.