San Francisco (and much of California) has effectively a one party system. This means that often the real elections are primaries or along party lines. Chesa Boudin and Gavin Newsom are both in the same political party, but their political views are vastly different.
in this social respect though, one party actively promotes 'diverse' lifestyles while the other just accepts them. I don't think SF would have come to be under the latter, nor could the latter exist in SF