It's something that cannot be hidden. So different from religion, drug usage, sexual interests, etc.
If ever you discover EMPATHY, being able to recognize & feel the emotions of others (pets, babies, children, adults, etc), you might discover the effects of skin color.
When a baby is born: SKIN COLOR. Black, white, off-white, blue, yellow? It could be a serious medical condition, or a genetic throwback.
Next: general body appearances, including sexuality.