I once took a Uber ride with an African-American gentleman as the driver. He had previously been a policeman in the SFPD, and his uncle owned a print shop in the Western Addition. He refused to sell his shop when Justin Herman's "renewal" project started. Shortly after, persons unknown vandalized and destroyed the print shop at night.
Ok, well that was over 50 years ago. A lot has changed since. Currently San Francisco is one of the most diverse and liberal large cities in the country. The black population is certainly lower than various surrounding cities such as Oakland, but that doesn't mean it's mostly white.