One possible scenario is if Naruto is constantly blamed for the team's failures. For example, if every mission that goes wrong is pinned on Naruto, even when it's not his fault, he might start to hate the team. This could be due to a misperception by the other members or a malicious plot within the fanfiction world.
A lot of these fanfictions have a theme of isolation. Naruto is pushed away from Team 7, either physically or emotionally. For example, they might exclude him from important missions or conversations, which makes him resent them. Another plot point could be a shift in Naruto's character. Due to the hatred, he might become more cynical or bitter, and this change in his personality is often explored in these fanfictions.
There could be a fanfiction where Team Seven is brainwashed or under some sort of mind control. As a result, they turn on Naruto and attack him. This would be extremely hurtful to Naruto, both physically and mentally. He would be confused as to why his friends are suddenly trying to harm him and it would shatter his trust in them.
Perhaps in this fanfiction, Naruto has been influenced by some external force. It could be a dark entity that has corrupted his view of Team 7. He might see them as a hindrance to achieving some greater, more self - centered objective. Also, it could be that Naruto has had some sort of personal revelation about his past and blames Team 7, or certain members of it, for things that he now believes held him back in the past.
In some fanfictions, Naruto might be depicted as hating Team Seven due to a miscommunication. For example, if Sasuke is written as constantly undermining Naruto within the team and Sakura always takes Sasuke's side, it could lead to Naruto feeling isolated and developing negative feelings towards the team.
It completely flips the dynamic. In the original storyline, Team 7 is a close - knit group. But in this fanfiction, Naruto's hatred for them disrupts that unity. It could lead to new alliances and rivalries. For example, Naruto might team up with former enemies who share his dislike for Team 7.
It could cause some division. Fans who like the fanfiction might not understand why Sakura is being 'hated' in it and might defend the work, while those who understand Sakura's character well might side with the idea that she would hate it. This can lead to arguments and a split in the community.
In the original, Naruto's team supports him and they grow together. However, in this fanfiction, the concept of Naruto hating his team means that all those positive interactions and character developments are thrown out. His relationships with his teammates, which were based on mutual respect and trust in the original, are now replaced with negative feelings.
One possible reason could be a misunderstanding. Maybe his team made a decision without consulting him, which made him feel left out and thus led to hatred. For example, if they took on a mission without him, Naruto, who values being part of the team, might feel betrayed.
One common scenario is jealousy. Suppose Sasuke becomes extremely popular or powerful quickly in the fanfic. Sakura might focus more on Sasuke, and Naruto could be pushed aside. This makes Naruto feel like he's not as important to the team as he thought, and it hurts his feelings.