This makes no sense. A lot of non Anglo-Saxons are as white as Anglo-Saxons. As I said:

the distinction between “white people” and “white skin people” makes it clear that the boundaries of “white people” are in effect defined by who is not a target of racism

If I understand your point correctly, it's that some people who are sometimes in the category of "white" can be victims of racism in some situations because they are on the margins of whiteness. That's true, but it doesn't make racism against white people real.

Saying "racist" things about white people is not racist against those on the margins of whiteness who are sometimes conditionally white, such as Slavic people. You can be racist against Slavic people in certain contexts by saying racist things about Slavic people (and generally in those contexts Slavic people are not treated as "white" because that's what "white" means), but not by saying "racist" things about white people (which isn't possible).