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.