Just a side question. I lived in Santa Clara for a summer and spent basically all my nights out with a black coworker including going to SF multiple times and

Just a side question. I lived in Santa Clara for a summer and spent basically all my nights out with a black coworker including going to SF multiple times and never saw any racism whatsoever. The author seems to imply that SF is really racist. Is there any truth to that or did I just not notice while I was there?