One way of describing moral development is in terms of general levels; egocentric, ethnocentric and worldcentric. One starts with an exclusive concern for oneself, then the group – whichever group one identifies with – then a concern for everyone in principle. The Green MEME liberal has a worldcentric developmental level. Their infatuation with egalitarianism can lead to moral and cultural relativism. No moral perspectives are better or worse – all are equal. The same applies to cultures. Cultures are not better or worse, just different.
Moral relativism implies moral nihilism. If one moral perspective is not better than another and you can’t be wrong, then morality is null and void. Cultural relativism says one can’t compare morally the practices of different cultures. Again, there is no question of moral realism or the notion of objective values transcending cultures.
The goal of cultural relativism is tolerance. It is also intended to avoid ethnocentrism and the claim that my culture is better than your culture simply because it is my culture. The liberal in this instance conflates ethnocentrism with bigotry. This is obviously a mistake. One can have a preference for one’s own culture without simply denigrating out of hand other cultures, just as one can have a special love and preference for one’s own parents or children, without making a moral mistake.
The morally worldcentric liberal and cultural relativist seeks to get rid of bigotry by removing ethnocentrism. Thus they make identification with a group a sin. They want to go straight to the transcendent, bypassing the immanent. This is a form of Gnostic world-hatred. It is the situation of the misanthropist who hates and despises all particular human beings while professing love for “humanity” in the abstract. Here is the moral and metaphysical error.