Civilized societies should've stopped eating sushi the day fire was invented.
That's bad about putting all the black patrons upstairs, but I was told a story by a friend who worked as a hostess when she was much younger....the restaurant had three small rooms and each room had two waitstaff. She was told to put the first customers in room one, second in room two, third in room three, fourth in room one fifth in room two, sixth in room three etc etc. This was so everyone could be waited on equally and the waitstaff in one room wouldn't be run off their feet while another room would be sat empty....anyway, what happened was that every third set of customers just happened to be black so they all ended up in the same room and it caused a problem because they obviously assumed they were being shoved in the same room together.