Read Nick Cohen on Maryam Namazie in today's Observer. He quotes her as saying:
Human beings are worthy of the highest respect, but not all opinions and beliefs are worthy of respect and tolerance. There are some who believe in fascism, white supremacy, the inferiority of women. Must they be respected?And she is puzzled by those 'supposed liberals' who give 'precedence to cultural and religious norms, however reactionary, over the human being and her rights'.
That is indeed puzzling. To put it in crude footballing terms: there are those cultural norms - say, not embodying the equality of women - and there are these cultural norms, which do embody the equality of women. As both are sets of cultural norms, that makes it 1-1. But then these cultural norms are better than those ones in that they don't arbitrarily discriminate against a (very large) group of human beings. So that's 1-2 - at least - in favour of these cultural norms. The result seems clear.
Please don't be discouraged by my frivolity from reading the whole thing, which isn't frivolous at all.