Yeah, especially with pronouns there's a point where misgendering is showing disrespect not just to the person but to all trans people. (But when people misgender each other, they *are* doing it to show disrespect and to despise the person, you just don't despise him *enough* to be willing to dehumanize him in that particular way and with that collateral damage.)

That said if he announced his pronouns were now His Highness I'm absolutely sticking with he/him, where if a random 12-year-old at work did I would try to roll with it.