The whole thing is bullshit. Women not going for you is almost never about what you look like - fatties get shagged, uglies get shagged. The issue is that these guys have spent the majority of their teens sat in front of games consoles, talking only about gaming and not getting out in the real world and learning to communicate properly with other people. It is then no wonder when they go up to a girl and flirt that they get shrugged off. Because they invariably have no natural charisma, no ability to show an interest in another person and have a narrow interest range.
I know this sounds harsh but it is simply a way of blaming everyone else for how socially inept you are. Rather than seeking to improve your social skills, your ability to show an interest in others and building relationships, many of these so called incels simply whine and bitch about how shit society treats them. Its nonsense.
I am short. I wasn't all that good looking growing up. I had to work on my physique, get myself out there into social situations to develop the ability to make positive relationships with women (and men). I could have sat at home bitching about how women like tall, square jawed, muscular guys but the fact is most women I know go for the average looking guy. Sure they may have fantasies about chiselled physiques and actor good looks but that isn't the be all and end all. its the same as men who like big tits, narrow waist and long legs. Yes it may be a fantasy but they are just as happy being with other less "classically" hot women.
In summary, these whiners need to get a grip - take responsibility and own their social awkwardness and physical attributes. Stop blaming women for the fact you are inadequate, that is on you not them. Moaning is the most unattractive trait. Sexual attractiveness is almost always down to humour and charisma. You can be the most handsome, muscled lad in the world but if you have no personality it never lasts long. I know so many funny guys that talk women into bed by being funny.