“I figured ‘his’ is an established pronoun and I entered ‘majesty’ — an honorific,”
Well, he’s wrong ... and for direct address, they’d have to use “Your Majesty,” which is gender neutral.
Nobody studies grammar these days.
Seriously, though, I’m amused at the whole thing, although I see the value for foreign students in being able to identify their sex to the instructor/other students. What American knows whether Chen Min is a guy or a girl?