I can't watch horror movies either
I generally refuse to watch rape and/or torture scenes, or violent killings. At the very least, I will turn away and ask "is it over yet?" Occasionally, I will abstain from watching the movie/show at all, if the violence is prolonged and too much a part of the overall work. I'm not alone. Fortunately, I don't usually have to defend my choices. If you want to watch, fine by me, but I will probably be in another room, reading a book. I don't think I'm missing out on something that is aesthetically or culturally important. The same appreciation of the darkness of humanity can be obtained by reading the newspaper or some other fictionalized account. So I don't get why people feel like they have to foist their choices on another, especially if it creates such a negative effect. I don't care if Deliverance is a classic. I never, ever want to watch again that scene where that one of the guys is called a pig, has a knife put to his throat, and is threatened with sodomy.