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?
I think it was included to assuage concerns of forcing pronouns on users. It's easy enough to use someone's name if you don't know different. Pronouns also don't tend to come up in first person conversation, it's only when referring to someone else that it causes grammatical issues