Interesting how the first thing you reach for is the ad hominem of tying anything RP/BP to being “incel-speak”, in an attempt to silence any discussion in favour of the ideological narrative.
Yes, there are men in those communities who are despondent of ever having any “success” as society has defined it. That they face massive systemic barriers to success that they cannot affect, and extreme social punishments for failing to achieve that externally-imposed definition of “success”.
Throwing blame onto those who impose the rules is an understandable response by these men. An Immature, counterproductive, and inappropriate response, yes. But considering so many men have built their entire identity around societal lies and behaviours that were explicitly engineered to harm their chances of “success”, it is hardly a surprising response.
That’s why MGTOW exists - to show them that there is a path to life fulfilment and even happiness that does not hang from the sharp hooks of female (and societal!) approval. That there is a way to live that does not involve external blame and self-defeating hatred.
But most any RP/BP forum I have ever stuck my nose into has also had a fair amount of direct links to actual scientific research and/or real-world evidence which supports the female nature and behaviour that they have been experiencing and observing themselves. It doesn’t mean that they had any legitimacy in complaining or being upset about it, only that it wasn’t all in their head - it’s an actual IRL thing.
In other words, RP/BP is the “detox” from the societal brainwashing and psy-ops manipulation that most men have been subjected to all their lives, allowing them to truly understand why women do and act in the way that they do. MGTOW is the recovery that refocuses their attitude to intrinsic motivation and happiness, allowing them to live freely without any need for women.
And of course, a large proportion of women find that last sentence deeply frightening. A man who don’t need no woman? Who can live entirely on his own, happy and content? Heresy! It must be suppressed with all the social/verbal violence that can be brought to bear!
Hence, the derogatory term “incel”. It exists for no other reason than to shame men into compliance, as a thought-terminating cliché.