One reason could be that Naruto values respect, especially towards women. Perverts in fanfiction might go against this value of his. He has been shown to be protective of his friends, and seeing improper behavior towards them or others in fanfiction would make him dislike it.
Fan artists could draw Naruto with expressions of anger or disappointment when in the presence of pervert - inspired situations in their artworks. This visually conveys the idea that he hates such fanfiction. Another approach could be in the dialogue. Writers can write dialogues where Naruto voices his strong dislike for pervert - related fanfiction, perhaps comparing it to something that goes against the ninja way.
Naruto is a character who has been through a lot and has developed his own moral code. In fanfic, perverts might engage in actions that are inappropriate or immoral. Naruto, having seen the hardships in his village and the importance of integrity, would not be fond of such characters. He is the type to uphold good values and fight against those who violate them. Fanfic perverts might act in ways that are contrary to what Naruto stands for, like objectifying others or being overly lewd, which is why he would hate them.
One possible reason in fanfiction for Naruto hating Minato could be the lack of a normal family life. Naruto was alone most of his life, not knowing his father. If he were to find out about Minato's actions in a negative light, like seeing the sealing as a selfish act to save the village at his expense, he could develop hatred. Fanfictions often take these complex emotions and build stories around them.
Maybe Naruto is a character with a focus on his own ninja journey and goals. Love fanfiction might deviate from his core identity in the original story, so he 'hates' it.
Perhaps Naruto fans who are into the Naruto story for its action, ninja skills, and complex relationships within the Naruto world find Aphrodite fanfiction to be a distraction. Naruto is a character with a very specific identity and purpose in his own story, and introducing Aphrodite from a different mythology into his fanfiction might seem like a forced and inappropriate mash - up.
It could be that the essence of Naruto's character is often misrepresented in Superman fanfiction. Naruto is about hard work, friendship, and achieving one's dreams through personal growth in his own story. When put into Superman fanfiction, his character might be forced to fit into plots that don't align with his original values, which could lead to the idea that he 'hates' such fanfiction.
One reason could be the pressure on Boruto. In fanfiction, if Boruto fails to meet the high expectations set by Naruto's legacy, Naruto might show disappointment which could be misinterpreted as hatred. Also, there could be external forces in the fanfic world, like an enemy influencing their relationship, making Naruto seem like he hates Boruto.
In fanfiction, the evidence often lies in the way the author portrays Naruto's interactions. For example, Naruto may be shown being cold or dismissive towards Sakura, like avoiding her company or not showing any romantic interest. Meanwhile, with Hinata, he could be depicted as being more affectionate, like blushing around her or always coming to her aid. But it's important to note that this is all in the realm of fan - created interpretations and not the official canon.
First, she can simply avoid reading it. There are so many other forms of Naruto - related content, like the original manga or anime, that she can focus on instead.