I am so puzzled by this:
It seems to be that celibacy is entirely a choice. These men can have sex anytime they want (and even if they are significantly disabled, there are ways)."Incel" is short for "involuntarily celibate."
It's a movement made up almost entirely of men who claim they "can't have sex despite wanting to," according to incels.me.
What they are whining about is that they can't have sex with a woman (or whoever) when they want. They feel entitled to have access to a woman's body, and the ability to have an orgasm with her, at their convenience. And that level of entitlement is just, well, ill-making.
As a dumpy male-presenting person in my 50s with no particular distinguishing features or "game", it has been made clear to me that opportunities for sexual interaction with other people are not scarce at all. These "incels" need to get off the Internet and out into the real world.