['I was at a restaurant recently where the waiter refused to wait on a black couple', "That's awful. It's a shame that there's still racist people in 2018!", 'I know.  I got so mad at the things she was saying, I left the restaurant myself after offering to take the couple somewhere else to eat']
I would have done the same thing.
One time I witnessed a waiter refuse service to a black couple.  Not only did she refuse service, but she said some very rude and derogatory things to them.  I was so mad I left the restaurant and offered to take the couple to another place to eat.