This post brought back memories of infant school when we were being taught how to write letters and, by extension, use pronouns. One of the things we were told was that we could use 'Mx' when it was not known how to address the person (mainly if we didn't have any details of gender). It happily sat alongside the older terms of 'Master' and the like. It wasn't mentioned as a neologism. We were also told to refer to someone by 'they' if we didn't know their pronouns, especially if they were not well known to us. It was a strict no-no to use 'she' to anyone who wasn't still a young girl. If you did, it was met with "Who's 'she', the cat's mother?". It was like using an insult. It never seemed to be a big deal to a child (probably age 6-8 when we were taught 'proper' letter writing). This was back in the mid-80s and we were being taught by people who were born during WW2 or earlier. I wonder why there's so much fuss about refusing to acknowledge chosen pronouns nowadays. It's so simple!