There's almost 0 state efforts to preserve the cultural identities of immigrants of any kind
When people celebrate "diversity" in the West, it's just eating shawarma, drinking boba, watching Anime, listening to kpop, and eating at an Ethiopian restaurant. Pure commodification and consumerism masquerading as celebration and promotion of foreign cultures
Or you'll have people fetishizing about spicy latinas, lightskins, and Asians like they're fucking Pokemon cards
Similarly to how the patriarchy and masculinity harms men (who still benefit from them) by not allowing them to express themselves fully, white supremacy erases all cultural difference or diversity in favor of a single, unified, "culture", even to groups who enjoy its privileges. The fact that regional cultures are erased or commoditized by a uniformizing influence of consumer "culture", and of the domination of a single, unified "white experience", is to be lamented as well, just not as much as the more egregious physical and cultural harm done to PoC.