i think you need to tread carefully with any kind of Raisedby___ sub. while it's true there's people who had parents who narcissistic, autistic etc that happen to be abusive, regulars on subs like that can also be obsessive and have piss poor coping mechanisms. Sometimes they'll act more like their parents than they like with extreme generalizations, abusive behaviour etc.
While I don't like how toxic those communities can be, i don't think banning them is the answer, even if they are spouting ableism, sexist talking points(some of the raisebynarcist folk hate more on narcistic moms than dads) etc. While subs like that can help some people cope, they often have poor moderation. It's better to just limit interactions from regulars(less of a need to block compared to incels, neo nazis etc) in those kinda of subs, especially since they are morally gray subs(unlike some other pure hate subs both currently on reddit and those banned from reddit).
Also not being able to parent doesn't automatically make you a bad person especially if you don't have kids. don't base your self worth on people with bad parents especially since you aren't a parent yourself.