The difference is black chicks wear that shyt on their sleeves like it's a part of them.
For better or worse white ppl are much better at being fake. so even when a white chick having a bad day when a mf talks to them they crank onthat fake smile and engage you on a polite tip. I've got chewed out by a white chick and she was making this face damn near the whole time
Black chick on the other hand has a bad day and spends the rest of the week walking around in public like

And if you're trying to snap her out of it for the sake of conversation you gotta say something either very charming or borderline rude. Then there's the cashiers who stand their stone faced and don't say shyt to you outside of "Your total is 10.56$

" till they ring out the white lady behind you like "

Hi, did you find everything you're looking for today?"