The things that are under threat are the contemporary cultural values of openness and acceptance of other cultures/relgions/traits. These are truly valuable, positive aspects that stand out in contemporary American and European societies, and these are the things that are legitimately under threat, ironically, by those who attempt to normalize racism and xenophobia.
This doesn't seem right to me. WASP culture absolutely does exist. Anyone can see it in full display by watching films like Dead Poets Society or Home Alone.
Slavers deliberately mixed different groups of kidnapped Africans so they had no shared language and sold their children so they couldn't pass anything on to the next generation.
We are not the same.