You gave as examples;

“Master bedrooms” in our homes. “Blacklists” and “whitelists” in computing. The idiom “sold down the river” in our everyday speech.

I suspect those phrases are also present in non-white conversations. After all, pre-internet we were all raised on many of the same books, stories, and news reports.

If that is the case then a more accurate title would have been "All Americans Continue to Think Like Antebellum Slave Owners".