I’ve never actually heard or seen someone honor such a request online or IRL, and it would sound ridiculously stilted if they did. Where is Rumpelstiltskin's coat? Rumpelstiltskin must have left it at the bar. Will someone please text Rumpelstiltskin and let Rumpelstiltskin know?
A lot of those happened to be specific requests by particular users at the time pronouns were being added. There was a user who went by doe/deer and doe got deer pronouns added at deer request.