Though not in the same way, I think white American liberals are every bit as racist as the white supremacists but with the added ingredient of condescension. Certainly, they are perpetuating the myth of race so that they can signal their righteousness. For liberals, it is the other (not one of them) who is being beaten up and murdered by the police. The Christian truth is that it is one of us who is being beaten up and murdered by the police. But to accept that is to accept that the other is equal to us, is the same as us. Such acceptance is not possible for a racist.
The tragedy is that the manufactured other is now buying into this separation, even owning it, even enjoying it. This strengthens its otherness in society, makes it more identifiable and enables discrimination to prosper.