Incel is such an oddly self reinforcing thing. As I recall it the term started as a self identification (I can't get laid, there for am an involuntary-celibate), which ended up with these self ID people declaring someone else is at fault for their situation, then that attitude got so pervasive it became a given term (you can't get laid BECAUSE you're an incel).
Morphing of language and all, similar happened with 'woke'. Either way, if these folks could comprehend a simple fact that the one person you can demand change of is yourself then maybe they could get out of that cycle.