But, really the embroidery was white privilege. She trusted him because he was an older, white man.
How can we have authentic conversations about race with our children?

Do you have any evidence for this other than your own assumptions? Because nothing you described in this scenario suggests that at all. You’re right to want to oppose misconceptions that people have about people whose origins may differ from their own, but the way to do that is not to trade one set of false assumptions for another.