You teach behavior and biases, but it's well observed that kids naturally don't see distinctions between groups of people until it is taught to them, and that kids do feel empathy naturally, and will feel upset about perceived injustices and such. Isolating a white kid so they don't see a Black kid until they're 15 is a learned thing, if they're raised in a shared environment, they won't see a difference. What you teach is how to act on it (like sharing), how to handle emotions about it. Restricting experience is teaching.