Sure, I can accept this, but only if we accept that by the same logic black/POC have no culture.. Sure there is carribean culture, and nigerian culture, and tunesian culture... but by your own logic there is no black/POC culture.
Personally I think this is wrong, and that white people, black people, and many groups have a larger culture to them... but as long as we are consistent its a step towards sanity either way.