I realize you're probably just making a joke but the reality is that there are few people so ugly that no one would have sex with them. Even if you keep your standards high, I'm sure there's many cases of someone whose own mother would cry at the sight of that managed attract a model who is just into that.
But the attitude is very off-putting, more so than whatever physical characteristics they think disqualifies them from love or sex (and a good number of them aren't even unattractive but just have no self-esteem and hate themselves so much they either can't believe someone else would like them or that someone who does must have big problems of their own or is lying to use them).
Even the niceguy attitude is offputting, and the incel attitude is pretty much that but replace the sadness with anger and the depression with rage, and add a bunch of BS masquerading as the science of attraction that proves they aren't attractive and ignores that it's subjective and that there's this weird "so ugly it's cute" category that some/many people seem to have (though it usually applies to animals rather than people).
Googley eye napping.