I can’t speak for the GP commenter to whom you responded, but I can speak for myself when I say that I strive to to treat everyone the same regardless of their race (and not make a big deal out of race), while also being well aware of the prejudices and injustices that might affect someone on the basis of race out in the world. If that doesn’t describe “race blindness”, then we probably need to come up with a phrase to represent that person.