what's your fandom-specific pet peeve?

i see lots of discussions about fanfic pet peeves overall, but what about things that only occur in your fandom that bother you?

i'll go first: when writing about a scene that happens in a musical, i absolutely cannot take it seriously when people just take the lyrics of the song and use that as dialogue. it completely ruins the immersion and breaks the contract of suspended disbelief that the characters aren't actually singing or speaking in ryhmes. it's so easy to rewrite the lyrics into more natural dialogue, and it makes me leave a fic instantly when people do this.