Your point #4 will be magnified to the extreme in Tokyo.
This has nothing to do with the dating scene, and I risk deviating from the topic, but I felt this indescribable, overwhelming sense of freedom as an African-American in Japan that I never felt in America. I felt the difference in treatment, where I was treated better in Japan than in America. Women in Japan wouldn't walk on the opposite side of an alley whenever I walked by, nor would they act scared whenever I was alone in an elevator with them (I had an incident in Sacramento as a teenager when a white woman refused to enter an elevator with me and another black guy.) I felt like I was in a place where I could finally be myself. To me, being a "gaijin" in Japan was an upgrade from being an African-American in America.
But at the same time I can sympathize in that street interactions in California have grown openly hostile across the board. The level of polite hospitality is so low and paranoia so high that it is actually hard to go outside and do business without ending up in a confrontation of some kind. Just the other week I was crossing the street in SF after seeing a movie[1] and a lady(a white lady) crossing the other direction gave me the finger and screamed "fuck you, fuck you" for no reason I could fathom.
We passed, and then I had a feeling of deja vu and thought, "didn't that happen the last time I saw a movie here too? Does this woman just go around in the evening cursing out strangers for self-care?"
And that is the kind of thing that sounds dreadfully believable for SF these days. The privilege spares me from most avenues of material loss, but that's hardly something to be proud of.
[1] The film was Sorry to Bother You, if it matters. I enjoyed it
Now if you are a girl, things are actually tougher in Asia.