It is interesting to consider, that tropes like “all cultures are equal” and “everyone is the same” is a product of what I see as a cleavage zone between Leftism and Conservatism.
That cleavage zone is a Subjective view of reality, and an Objective view of reality.
The Subjective view of reality is a completely childish, Leftist construct, while the Objective view of reality is largely the Conservative view.
The subjective view of reality is the view that something IS the way that one wants it, rather than the way it is. And it is the path to ruin.
Thomas Sowell calls it the "vision of the anointed". It is impervious to reason, facts, and evidence.