This happened. The British Humanist Association publicly posted a Happy Humanist Day message on Facebook:
A humanist is someone who does the right thing even though she knows that no one is watching.
[Random bolding theirs.]
A good message, right?
Ah no, not so fast. There’s a problem.
Jane Brown Why the she? Big mistake to be so gender specific.
Did your jaw hit the floor? Mine did.
“She” is gender specific, in sharp contrast to “he,” which is not.
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Anyway, happy world humanist day.