Does this include the material conditions of human bio diversity? You deny "way of thinking" is itself a material differentiation but could that not be an expression of material conditions over time reshaping separate groups of people to act and think differently, who were through differing selective pressures, environments, adaptations and historical contingencies themselves "shaped" differently?
Or do you yourself have a religious belief in strict human blank slate equality?
I'm not saying relevance of culture, human bio-diversity, etc. are zeroes in terms of impact. I just get frustrated because they seem to be the only things talked about at the expense of any discussion about actual material conditions or control and distribution of resources