The hyperbole of "everyone" you're focusing on doesn't really seem a significant argument against him, when a bias so widespread is being discussed. The purpose is to get his ideas across with a sharp style, not to be 100% accurate, and if he were to say that this happens not to you necessarily, but rather to 99.9% of people, then 99% of his readers would probably think they personally fell inside the 0.1% that was immune to such thinking...

I'm likewise now pulling those numbers out of my ass, btw, for the purposes of illustrating my point, not the purpose of being 100% accurate.