As it happens I went back to spend a week in New York a few years ago. Against advice, me and the wife caught the subway to Harlem . The black people on the train made a great fuss of us and had lots of questions. The huge guard sat and talked to us too.
In Harlem we were treated very well. Went round the museum of black people history. Interesting but understandably rather anti-white. New York was great but not the place I would want to live. Carmel along from San Francisco was great. Clint Eastwood lives there, but then he can afford to.