Why did blacks in the south get upset when they saw a "Whites Only" sign at certain restaurants in the 50's? Why would you want to give your money to a racist? LOL I mean was the food that good?
Why not laugh and go somewhere else?
Are you serious? It had nothing to do with their "food being that good". In most cases it was worse.
The fact is that while whites were allowed to move about freely in a segregated society, up to and including going into designated "black only areas with immunity, "being caught in a "whites only" establishment was a death sentence for a black person.
It was a double standard. And it was nothing to laugh about, and damn sure is not a "mystery".