Well, that right there assumes a homogeneous "white" culture, which is false for a start.
How so, when I explicitly identified a non-white culture?
But I think that you're kind of agreeing with my point, which is that the culture shared across the demographics of a society isn't necessarily inculcated at home. But to the extent that we all operate in a shared culture, other influences are at play.
I disproved your point. School is an influence, but the bedrock of culture will be laid before that. In the US, native Americans are firmly cultural native Americans before they begin school. Black Americans are firmly black Americans in culture before they begin school.
With contact with other cultures, it becomes a choice of what to adopt of other cultures, what to reject, and what of one's original "mother" culture to retain or drop. But there is indeed a "mother" culture laid down before starting school.
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