Were at a point where you are not discussing the same thing but this might give some clarity

He’s describing a general idea of extremist self validation of violent and hateful rhetoric in online spaces that can and at times do lead to “extremism” (I hate the word but its here)

Both the inital post, and you, are pointing out that what is being discussed in the OP (which I imagine this person has not actually read, and was intellectually pointing out some personal misery) (which I do understand for the record) is, that validation in the sense of well meant and applied validating of ones human self or for having human experiences outside the “norm” (or inside it frankly) and being happier is not pushing people to extremism and doesn’t even apply by association to that version of validation so don’t do that

Just happy to clear that up feel free to correct me