PARIS—Rachel Khan is a 45-year-old writer and actress, half-Gambian, half-Polish Jew born and educated in France, who was appointed by the mayor of Paris to be co-director of a cultural center called La Place, or The Place, dedicated to hip-hop music in France. Then she became a target of the wrath of “le wokisme,” French version. Khan, who was already well-known as a dissenter from the identity-politics orthodoxy on race and victimization, published a slim volume titled “Racée”—meaning racy, daring, but also a play on words—in which she lampooned the politically correct idea that to be authentically black meant that she had to incarnate a “woke” ideology. “It’s supposedly anti-racism, but in fact it’s dogma,” she told me in Paris in November. “A black actress is supposed to be anti-colonialist. But just as I’m not obliged as a black actress to play a cleaning lady or a prostitute, I’m also …