There are few tropes I won't read but some will depend on my mood. I mostly avoid things like Major Character Death, self-harm, or major angst fics.
I have to be in the mood to read something labeled PWP anymore, unless it's short and/or by an author I really like. I've read enough porn to be fussy, I guess... ;-)
Oh! Reader- / self-insert. I don't even try those...
It's more the really bad grammar / spelling / formatting. If there's a wall of text, I'm noping out right away. I've slogged through some bad grammar / spelling fic if I think the author is not a native English speaker or I've gotten sucked into the story line enough to want to see how it ends. (For folk who English isn't their native language, kudos for doing something I'd never try in their language!)
I'll often pass by a fic where the summary is poorly written. If I have to puzzle out what the summary is saying, I suspect the fic is just as poorly written.
For some fandoms, it's a particular character or pairing that I have no interest in. Heaven forbid someone has paired a character I have come to dislike with a character I like -- again, I don't even look at that fic.
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