Well, one reason could be Sakura's constant nagging about Sasuke. Naruto has his own feelings and goals, and if Sakura is always pushing the Sasuke matter in a way that dismisses Naruto's feelings, it might make him snap. For example, if she keeps asking him to bring Sasuke back without considering how hard it is for Naruto.
One reason could be miscommunication. Maybe Sakura said something that Naruto misinterpreted as an insult to his dreams or abilities. For example, if she made a comment about his progress as a ninja in a way that came off as dismissive.
Another possibility is jealousy. Maybe in the fanfic, Sakura shows more interest in another character, like Sasuke perhaps, and Naruto, who has his own feelings for Sakura, snaps out of envy. It's a common trope in fan - made stories to play with the characters' emotions like this.
In fanfiction, Sasuke might snap at Sakura due to miscommunication. Sakura could be expressing her concern for him in a way that he misinterprets. For instance, if she tells him not to go on a dangerous mission and he thinks she is trying to control him instead of just caring about his safety. Another factor could be the influence of external forces. Maybe there are other characters or events that put him in a bad mood, and Sakura just happens to be there at the wrong time, so he snaps at her.
One reason could be years of built - up resentment. The villagers have treated Naruto poorly for so long, constantly shunning him and making him feel like an outcast. In fanfiction, this could reach a boiling point where he just snaps. For example, if someone in the village made a particularly cruel comment about his parents, it might be the last straw.
It could make their relationship more strained. Sakura might be shocked and hurt, leading to a rift between them. For instance, she may not understand why Naruto snapped and hold it against him.
It could be a situation where Inari is interfering with Naruto's mission in the fanfiction. Naruto is very dedicated to his missions and protecting his friends. If Inari were to do something that put Naruto's mission or friends at risk, Naruto would likely snap at him.
One reason could be stress. Izuku might be under a lot of pressure to keep up with his training and the expectations of being a hero. Class 1A's constant high - energy and sometimes chaotic behavior could push him over the edge. Another reason could be misunderstandings. If they misinterpret his actions or motives, he might snap in frustration. For example, if they think he's showing off when he's actually just trying to help.
One possible reason could be the long - standing emotional neglect Shinji has endured from Gendo. In the Evangelion series, Gendo is often distant and cold towards Shinji, and in fanfiction, this could build up to a point where Shinji snaps.
It could be Orochimaru. He has always been a source of trouble and if he manages to pull off some really devious plan that directly affects Naruto or his loved ones, it might cause Naruto to snap.
One possible reason could be that she might have underestimated Naruto in the past. She often belittled his abilities and dreams, but as she grew and realized his true strength and determination, she felt the need to apologize for her previous behavior.