Kids don't see skin color the way these ideologues do. They look at it like hair color. My twin brother and I were literally the only white kids on our school bus, attending mostly black public schools in a mostly black county in southeastern Virginia. We were never really aware of skin color as a thing, just "this kid let's us borrow his gameboy and is nice", vs. "this kid punches us in the back of the head on the bus cuz he's psycho". Race was a useless proxy for good/bad when you are in a heavily integrated school system, because it's ALWAYS been a useless proxy for judging human character.
People that speak like this publicly ("sea of white children") are THINKING like this constantly.
In my opinion, he projects his own bigotry and obsession with skin color onto everyone else around him. That's what bigots of all colors do.