I find what you are saying to be fascinating, and I feel like this is approachable from a thousand angles.
First, let's address the PTSD. It sounds like you've had a very bad experience in the past, and this scene is causing you to remember it, and even, to an extent, to relive it. I'm very sorry to hear this and I hope things improve for you. Personally, I've never been choked, and I don't experience the same visceral disgust as you reading the same thing.
Next, to reiterate what people have already said, you're in control of the story. The MC didn't decide to go to school naked, I decided he should do that for kink reasons which didn't pan out when no one was present. Similarly, you decide if the MC rapes Kate. You can instead tell her to apologize, and when she offers to suck your dick as a sincere apology, you can reject her outright. Then her face turns scary and you wake up, classic dream stuff.
But that's not your point! You've lasered in on "the character of the dream-rapist MC" and that's the character you take issue with. Why does this character exist? Because a writer wrote it, and readers read it. Sometimes writers will write things intending to horrify and upset readers, horror novels for an obvious example, but this is not that (though that scary face if you rebuff her actually was pretty scary). It's an erotic fantasy. Some people find it hot. Degradation, dubious consent, they want to immerse themselves in a world where all that stuff makes sense for a second or two. Personally I don't get it, but I'm guessing they're as likely to commit rape as I am to be arrested for public indecency. It's not a path, it's an outlet. Hearths generate heat, chimneys whisk away the resulting smoke to a less hazardous place, and no one is bitching about the concept of chimneys, come winter.
Finally, your whole entire thesis is just hilariously wrong. Suppose women were to blame for his fate, or don't; the fact is that he has another chance - it's in the title. In aggregate, he's not taking names and playing the part of a heterosexual time-travelling Jeffrey Dahmer. He's building relationships he previously missed, and experiencing a lot of sexual situations in the process. Oh lucky me, those are the things I'm on this website for.
As an aside, when I play this game I don't vibe with the "incel" part of the MC that resounded in you. In fact, I don't even notice it. I have enough disposable income that I could save up and buy a plane ticket to someplace where prostitution is legal and pay for sex if I really wanted to. The decision not to do that is mine. Therefore I'm single and voluntarily celibate... a volcel, I guess. Pronounced "voxel" because why not.
