People need to mock the fuck out of this. Take on pronouns like "milord/milady", and actually follow through to ensure it's enforced to show that this is utter fucking stupidity. Fuck it, go one further and go with "Massa" or some shit. Make them play by their rules and do so with a grin. Everyone can know it's a load of shit, but they need to play by the rules they put forward. Anything less will ensure this creep continues.

You don't get a response by letting the frog continue to boil. And while accelerationism is often top tier stupidity, it does hold validity when utilised to show why something is bad before it goes further and further and further. Don't let the slope slip, let it avalanche so people can't just adjust to changing rules.