Maybe in some fanfictions, the writer portrays Kakashi in a way that Naruto doesn't resonate with. For example, if Kakashi is written to be too strict or distant in a different way than in the original story, Naruto might not like that version of him.
One possible reason could be miscommunication. Maybe Kakashi has been involved in some secret missions or decisions that Naruto doesn't understand, leading to a breakdown in trust. For example, if Kakashi made a call during a battle that put Naruto or his friends in danger without fully explaining it to Naruto later.
Maybe Naruto just sees Sakura as a friend. He might have a different idea of his ideal partner and Sakura doesn't fit that. His feelings for her could be purely platonic.
One possible reason could be his past traumas. Naruto grew up alone and was often shunned by the villagers. Physical touch might remind him of the times when he was pushed away or bullied, so he has developed an aversion to it in fanfiction.
Well, in some fanfictions, it might be because the writer wants to create an alternative storyline. Maybe they think Naruto has a different type of relationship in mind, like a more platonic or brother - sister - like bond with Hinata instead of a romantic one.
Well, in Naruto fanfiction where Naruto humiliates Kakashi, it's a bit of a tricky concept. On one hand, fanfiction is a space for creativity and exploring different scenarios. But we have to consider the relationship between the two characters in the original series. Naruto looks up to Kakashi in many ways, so for him to humiliate Kakashi goes against the grain. It might be interesting if it's part of a story about Naruto growing in power and challenging his old mentors in a respectful way, but just blatant humiliation might be seen as disrespectful to the source material.
Another reason could be that in this fanfiction, the plot is set in a way that there is a new training system in the village. And this system doesn't involve Kakashi in Naruto's training. There could be new mentors or a completely different approach to training young ninjas like Naruto, which excludes Kakashi from the equation.
Well, there could be various reasons. Maybe the writer wants to create a unique situation where Naruto is silent to add mystery. For example, if the fanfiction is set in a scenario where Naruto has lost his voice due to a curse or some kind of magic. It could also be that the author is focusing on other characters' reactions to Naruto's silence, which can bring out different aspects of their personalities.
There are many interesting fanfictions on this topic. Some might explore the relationship between Kakashi's father, Sakumo Hatake, and the events in the Naruto world that we know of. It could delve into his past missions, his influence on Kakashi's upbringing even though he passed away early. Maybe in some fanfictions, he has a connection to some of the main plotlines that Naruto is involved in, like the overarching story of the shinobi world and its conflicts.
Perhaps they believe Naruto got too much attention or development in the original series while their favorite side characters were overlooked. So in their fanfic, they express this feeling that Naruto doesn't deserve all the love from fans.
Well, some fans might create such fanfiction because they think Naruto's relationship with Sakura was more of a friendship. They feel that Naruto had a deeper bond with other characters like Sasuke in a different way than a romantic love for Sakura.