Most reddit tier leftists are faggy idealists who consider thought, opinions, and political lines to be fundamental and defining. Hence, they throw 'incel' around as a political insult. They see 'incel' as defined by a general collections of ideas about gender, women, sexuality, dating, feminism, etc. It's a fantasy that has no consideration for reality.
In reality, incel is a state of being - literally a guy who, for whatever reason, can't get out of his own way to commit the minimal task of spasming his penis into a living, semi-willing woman.
But, living in existential reality isn't a habit of reddit tier leftists. Instead, they prefer to retreat into their fake and ghey fantasy of a moral hierarchy of beliefs,