There's still a lot of people out there who consider 'they/them' to be nonstandard when used for a specific person (as opposed to 'they/them' as a replacement for the generic 'he'; almost everybody opposed to that has come around or died).
Yeah, I should have clarified that I don’t consider that non-standard. Well, it’s semi-standard, I suppose. But yeah, I had in mind the ones more like ‘xe’ and ‘xer’.