At the meta level this is a symptom of the fact that the polarization of our culture is extremely deep. We are polarized on epistemology, metaphysics, and what

At the meta level this is a symptom of the fact that the polarization of our culture is extremely deep. We are polarized on epistemology, metaphysics, and what it means to be human, with the left favoring various forms of scientific or empirical epistemology and a mutable model of human nature and the right favoring revelatory or traditionalist epistemology and an immutable model of human nature. The latter is true of the secular right as well. Just substitute "evolution" and "history" for God and mystical revelation. The secular right believes that human inborn characteristics are immutable and culture is a product of evolutionary processes that cannot or should not be rationally understood or modified. All the Neo-racists and HBD types are basically evolutionary-historical conservatives or reactionaries who see inequality as a revealed result of a process that is beyond human understanding. It's getting to the point that it is not even possible for the two sides to communicate because they do not agree on language, logic, or basic rules of discourse. The left and the right are cognitively inhabiting different universes. Humans subjectively experience extreme cognitive dissonance as actual discomfort. I think this explains the intolerance. People are emotionally reacting to the level of cognitive dissonance this divide generates as if ideas from the opposing side are physical attacks. I agree that the right is no different. Go into one of their bubbles and voice liberal ideas and you'll get the same reaction Milo gets on a Berkeley college campus.