So even though I'm not an incel, incel supporter or closet incel, I'm about to give you some honest feedback that isn't intended as a personal attack.
1. It seems like you use that as something of a reductive explanation for some of the people who hold different opinions than you or oppose modern feminism and the modern social justice movement in order to undermine these positions without addressing them. When you throw the term around it seems more like an unfounded ad hominem than a discussion about the actual phenomenon, and I don't think most of the people criticizing modern progressivism are doing so because they think the SJWs are keeping them from getting laid. Most of the criticism of modern progressivism I've seen relates to either an individualist point of principle, or a free speech/thought point of principle. For me personally that is the case.
And just to be fair and honest, I'll admit to being a virgin, though I wouldn't consider myself a sexually frustrated incel. My own interests lie more in the direction of an emotionally intimate relationship than casual sex. I'm a religious guy whose very passionate about my values and so a woman I would actually want to build that kind of relationship with would be someone with similar enough values and with an actual interest in discussing things of that nature, I love discussing that shit. On top of that I'm also a stoner, so they'd have to not be immediately turned off by that, I can be rather eccentric in real life which some might find offputting, and I'd need to have reasonably decent chemistry with her as well. As such there are plenty of women I find attractive, but only a few I'd actually be interested in pursuing a relationship with. I've set a certain standard on who I'm willing to share myself with, and I'm willing to accept the consequences of that. I'm fine waiting for the right person and until then my left hand will do.
I should note though that I've personally never felt offended by the term incel as if it speaks to something about me, as I don't really consider myself a sexually frustrated person. I just mentioned all that for the sake of honest transparency and to show I'm serious about providing honest feedback and not just attacking you.
2. There's just something about your fixation with incels that seems like you're punching down in a manner of speaking, like you're weirdly focused on attacking a group of people that have hit a certain rock bottom in a manner of speaking, even if it's their own fault, which can come off as kinda delighting in other people's problems in life. It's also just not really a response that serves as anything of a solution to the problem. If their issues are rooted in sexual frustration and a lack of social skills, than further ostracizing them just seems like it would be something that would exacerbate the problem.
As for why they make your skin crawl well that's an easy one. Whiny entitlement and bitterness aren't exactly admirable traits for a person to possess, much less for a community or ideology to be centered around. It comes across as pathetic, and as reflective of a certain weakness in moral character, which could understandably evoke feelings of disgust in people, especially if these are traits exhibited by grown men. It's not that there isn't legitimate criticism of them, believe me there is, it just seems like you have a disproportionately odd level of contempt for them and fixation with them.
As for straight men voluntarily choosing to not have sex with women for reasons other than religious, that's MGTOW and that's kinda it's own thing.