For those that don't know the term but an "incel" is someone that is involuntarily celibate.
In other words they can't get a girlfriend. But then they can't just accept this they broadcast their anger against women.
They used to have a big community of Reddit but that was banned. But they made a website and this is their reaction to the shooting:
https://incels.me/Thread-A-hERo-rise...Shooting-22041
When they talk about Chad and Staceys, those are those good looking ordinary folk that they hate, as they've done ok in life.
America really is in the pits when it comes to certain things like youth culture.