This is my newest pet peeve. I've been reading stories lately where MCs are supposedly hardened killers, but they'll spend lengthy parts of chapters getting sensitive and being afraid to offend someone, asking questions like"is it okay if I say this?" Just as bad, they go on lengthy tangents about morals, justifying why they fought and killed whatever they killed, or why they didn't. Hardened killers don't have these moral dilemmas people. Once they've made the decision to end something, they think nothing else about it once the deed is done. This is a annoyingly nonsensical thing that aggravates me when I read it. I can just tell what kind of people those who write like this are.
It's like listening to little kids feel guilty but still come to terms with the fact that they stole that last cookie and didn't tell anyone.
Won't read GL, BL, Gender Bender etc.
Won't read Netorare.
Won't read Female MC's because 75% of the time, it's just an excuse for male authors to insert Lesbian scenes. The other 25%, is female authors inserting "mUh FeMiNiSm" nonsense.
The moment a story has a character saying, "You should never kill", even if its a side character, I'm so immediately repulsed that I quit.
Any time a modern-world MC appears in a medieval-esque world, and then at some point starts trying to change it's culture to a modern one, I drop. Realistically, it isn't possible, and I'm not interested in reading the latest college-kid protagonist screeching about ideals he barely knows anything about beyond what his equally foolish friends incorrectly said, or whatever he read from some very awful and misleading CNN/MSN articles. So yes, if MC goes to a world with slavery, and then immediately begins searching for a soap box to stand and preach on, I'm out. It's tiresome, it's imbecilic, and it's not realistic. In reality, he'd be killed or enslaved himself.
Won't read anything with characters where having this made-up "what's your pronoun?" nonsense is a thing.