Another option is to engage Percy in a conversation about why he hates it so much. By understanding his reasons better, perhaps a compromise can be reached. For example, if it's a matter of certain themes in the beer fanfiction that he dislikes, there could be an agreement to only expose him to fanfiction that doesn't have those particular elements.
If someone really wants Percy to at least tolerate it, they could try to find beer fanfiction that is more tastefully done or that has a different take on the concept. Maybe some fanfiction that uses beer in a more symbolic or light - hearted way rather than in a way that might be off - putting to Percy.
One thing that could be done is simply respect his opinion. Don't try to force him to read or like poker fanfiction. If others like it, they can enjoy it among themselves without involving Percy.
Respect their feelings. Just don't force them to read or be involved with the fanfiction.
One thing that could be done is to keep the fanfics away from him. Don't show him any new fanfics or talk about them in his presence.
Perhaps the fanfiction community could create some guidelines for writing Alola - related fanfictions. These guidelines could ensure that the stories are in line with Ash's character and the spirit of Alola. If the quality of the fanfictions improves, there's a chance that Ash might not hate them as much.
The writers could stop writing that type of fanfiction if they respect Ash's 'feelings' (assuming he were a real person with real opinions).
He could simply avoid reading it. Just stay away from any fanfiction platforms or books related to magic fanfiction.
If it really bothers her, she could try to find a community or group of people who also dislike Bella fanfiction and discuss her feelings with them. This way, she might feel less alone in her dislike and could even get some ideas on how to deal with it better. For example, they could share tips on how to filter out Bella fanfiction when browsing for new stories.
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.
One option is to simply avoid reading or engaging with Rias fanfiction. If the OC hates it, there's no need to subject it to that content.
She could also engage with the fanfiction community and share her views. Maybe by expressing what she doesn't like about the current Hermione fanfiction, some writers might take her ideas into account and create something more to her taste.