Attempts to be dark/edgy. I went through an emo phase when I was in middle school. I had to read so many dark/angsty things friends would share with me (abuse/depression/suicide/death/self harm, ect.) I thought they were annoying and overdone then. Now that I'm in my twenties they're even more cringeworthy. I just feel embarrassed for people who say they are into dark things. It's all very fictionpress 'darkness'

Related to that I don't understand the point of sad endings. I read fanfiction for escapism. I'll read actual literature if I want to read something with an emotional impact. I've read one fic ever that actually made me cry at the end, but I was hella high so it probably doesn't count.

Ditto on unrequited love, love triangles that don't end in poly, and break up fics. What's the point? If I want to hear about failed relationships I'll just ask anyone ever to tell me about their life.