The concept of race extends from xenophobic tribalism.
We are one race, with minor differences in skin tone due to sun exposure at varying latitudes and climate.
Eons of evolution is not undone in a few decades.
And if you've never seen a white person get a tan...then go outside!!
You're clearly Vitamin D deficient....
I'm assuming the most extreme case would be seeing different shades of gray (any more extreme and you would just be blind). If we all only saw gray people would still be different shades.
Also the title 'colorblind' doesn't make sense because black and white are still colors, so we shouldn't even see THEM. In fact, anything we would see being colorblind would still be a color, so...