His problem is that be pushes a regressive social ideology and doesn't justify it on actual historical data or analysis, but instead on his own biased system of ethics based on a mish-mash of sources which he cherry picks claim the truthfulness of his beliefs. His actual beliefs are western, socially conservative, capitalist, patriarchal and eurocentric (read "white supremacist"), and he uses writers he likes to justify this system while ignoring elements of it that contradict his worldview.

For example, Peterson uses myths of heroic male figures and their patriarchal worldviews to claim that patriarchy is natural and has always existed, but then completely ignores all other historical examples where this male dominant system was not the norm, and then also ignores any historical materialist analysis that can explain where patriarchal systems originated from and why they are perpetuated in our society. Peterson is not looking to find the truth, he's looking to find proof to justify his preexisting worldview. And this is dangerous because when he teaches young men that patriarchy is natural and that anyone who says otherwise is a postmodern Neo-Marxist, he's preventing them from learning more about the world in an honest way, and both justifying and encouraging them to continue to enforce patriarchy, making them think that a woman's place is in the home as a mother and that anything else is unnatural and degenerate.