I'm genuinely struggling to understand your point. What do you think "white supremacy" means? I understand it to refer to the belief that white people are genetically superior.

> genetically superior

Genetically and culturally. Here's the white supremacism in your first comment:

> a majority-Bangladeshi town or neighborhood where people behaved indistinguishably from people in Idaho, Wyoming, or Vermont

Immigrants want to actually keep their culture, and that's okay. They should be allowed to keep their culture, even if it is unfamiliar to white folk in Idaho.