The author here clearly is extremely superficially familiar with the writings of rationalist people and views them from a preconceived standpoint. Comparing beliefs of Yudkowsky to dianetics is nothing short of misguided, whether you like him or not. This is a textbook study of motivated reasoning.
A libertarian socialist podcaster tries to discuss an online culture that is adjacent to Silicon Valley tech scene. He then proceeds to take movement’s worst manifestations as its essence. One would have to be naive to miss the source of his bias.
My feeling is that he understands your "online culture" much better than you, is very balanced and careful in the video, and you're probably a lot younger, inexperienced with internet groups and impressionable than him.
Take his advice to talk with (and listen to!) people outside your cadre, and to consider the possibility that you're entirely in the wrong. And maybe to touch grass.
