HOAs and the restrictive covenants that enforce them became popular for the purpose of keeping out Blacks (well, and other undesirable minorities, but mostly Blacks), and while they've been prohibited from actually (directly, at least) doing that for some decades, they continue to represent (because of who is willing to devote energy to regulating their neighbors through them) the same kind of cultural identity enforcement and homogenization by narrowminded elites that would keep out the "other" if they could.