I grew up in a monoculture, which was not unusual 50 years ago. People of other races and cultures were a topic to studied, not friends and neighbors. I’m thankful today’s American children experience racial and cultural diversity naturally, as part of their daily, normal lives. To our grandson, a “black lady” is a woman of any race wearing a black dress.
Apparently, people nowadays say that raising your kids to not really notice race is the worst possible way to raise them, and they'll end up racist... I don't really buy the argument, but it is repeated a lot.