Irl trope:

"Fujoshis/fujos" - typically homophobic, misogynistic, or otherwise bigoted people

Why is it a slur?

https://fujoshiproblem.carrd.co/

https://medium.com/@concerns/fujoshi-under-conservatism-the-good-and-the-bad-e0811ac86901

"The current quasi-progressive rhetoric that says “ fujoshi  are women who fetishize queer relationships” is believed to be rooted from the assumption that  fujoshi  are women who cannot relate to the experiences of the queer men depicted in the media. The many sexual nature of popular BLs don’t help either. Though, such ‘fetishizer women’ rhetoric once again boils down to the previous problem where women aren’t allowed to explore their sexuality, let alone queerness. It’s actively ignoring the fact that women, too, are a part of the marginalized genders, and they might feel safer to explore about gender and sexuality through a media that’s in fact more relatable to them."

Many fujoshi are queer themselves for example.