I don't know how unique I am. Probably not very, at least on this topic -- trigger points in fiction. My trigger points don't cause PTSD flashbacks or anything like that, but they can leave me circling around and around, trying to resolve the trigger. I don't always succeed.
Sometimes those points are so dominant that they don't go away. I've written one of those -- the way Nori treats Maya in the first few chapters of Amazon: Companion. I rewrote and rewrote the scene in Malora's tent, trying to resolve the issue, trying to find a way the book didn't end after 50 pages. It's been 13 years, I believe, and that still bugs me. I haven't forgiven Nori, even if Maya has.
My biggest trigger in fiction, however, is based on betrayal. Friends who betray friends, or authority figures who betray their offices. If I start to read someone else's book, and either of those are a major theme, then either it better become darned clear very early on the person isn't going to get away with it, or I'll probably put it back. I read for escapism, not to grow angry.
Most of my reading is via Kindle Unlimited, and I'm more than happy to stop reading for any number of reasons. Poor writing is my main reason, but too much reality is another. I don't know how often I put a book back, but it's probably once a month, on average.
Years ago, I read a book where the betrayal happens fairly deep in the novel. I finished the novel, but today while I was supposed to be working, my mind thought of that book, and it got me annoyed all over again. I'm not going to out the book or author, although people may figure out what I'm talking about from a few clues. Possibly. In the story, the main character is betrayed in about the worst possible way, in a fashion the MC will lose her wife, her status, and if she ever returns home, probably be arrested and possibly executed. And the betrayer looked her in the eye while doing it, pretending to be absolutely the best of friends.
I should add the MC had earned that friendship, earned it in the most dramatic of ways.
But it's not the betrayal that gets me. It's what happend after that. The MC told the betrayer exactly what she thought of her, and the word "coward" was used. Now, at this point, I think the author had written herself into a corner, much like I did with Nori and Maya, and she wanted a resolution. So how did she handle it?
The betayer demanded single combat to resolve the dispute and then won.
Fine. So be it. But the part that gets me is the MC then forgave her. It was the sort of thing you don't forgive.
Winning single combat doesn't earn forgiveness.
I read all this at least a decade about, probably about the same time that Nori was abusing Maya. And just like I've never forgiven Nori for it, I don't forgive the betrayer, and I haven't really forgiven the author for it, either.
Which is absolutely ridiculous. It's fiction. It's just a book.
Talk about hanging onto things I should have let go of a long, long time ago.