I love this piece, because you acknowledge the need for learning history, recognizing context, and having in-depth conversations (rather than one-way conversations guided by slogans, sterile academic definitions, or canned talking-points).
I also love how you rightfully and perceptively phrase/identify it as "white supremacy culture" -- because it's the "SUPREMACY" part that's at the core of the problem.
Many people simplify things by deriding "white culture" (without the "supremacy" qualifier)...unfortunately, simpler isn't always better.