I think what we're looking for is that it's just another attribute, no different from whether the person has blue or green or brown eyes, or what style shoes they're wearing.

In a conversation with my boss the other day, a newly-hired AWS engineer came up. I've met him just once, and helped him get situated because his desk is near my team. I realized that although I'd interacted with him to that degree, I had absolutely no recollection of what his race was (describing him was a logical part of that conversation). I think this is what's sought.