Dorsa Derakhshani may be today’s bravest feminist. As the 18-year-old Iranian chess grandmaster competed at a January tournament in Gibraltar, she refused to don a hijab, in defiance of her country’s Islamic authorities. She was later removed from the national team. Her 15-year-old brother, Borna, was also booted, for facing off against an Israeli chess player.

It would be nice to report that Western feminists rallied to Ms. Derakhshani’s defense, but they didn’t. America’s liberal feminists have been busy planning a “Day...