We need to be able to criticize cultures, as they are choices and not unchangeable traits at birth, and some cultural behaviors are absolutely unhealthy. Your premise opens up certain cultures to be immune to criticism, which is a terrible thing.

You choose your beliefs. Not your genes. That's the problem with racism. Genes are not a thing you can hold someone accountable for.

In America, there isn't really. For the most part, immigrant groups have adopted a culture completely or substantially different than the one from which their ancestors came.