Same triggers here. I used to finish books no matter how mediocre they were, but certain topics would make me abandon them at the drop of a hat. I recall at least 4-5 books that made ma wanna puke: one was Tiger, Tiger! which I bought on sale and had no idea it contains pedophilic stuff, two that described bestiality, one written by a gay guy who is describing a rodeo or something like that and feels Schadenfreude when a lady gets attacked by the bull ( I think he expresses his sorrow that she didn't die?). Also sexist stuff is a big turn off.

One disappointing literary experience I couldn't get over is Mario Vargas Llosa. I was going through a "Nobel laureates" phase and thought I'd pick one of his books. Can't recall the title, but a few pages in and he was describing him and his pals abusing some hens. I was too baffled to comprehend what that text was about and I wish I could bleach it away from my mind. Needless to say, I dropped the book and lost my interest in anything written by him, even if he's a literar genius, that was enough for me.