Instead of "s/he is" you can say "they are", even though it's singular. "They" is the preferred pronoun for any situation where gender is unclear or (usually, but not always) for non binary people.
Oh sorry I brutaly translated this from French where we say" iel " (contraction of "Elle" and "il" our feminine and masculine pronoun).
I already saw they but I didn't thought about it.
Well, it's a neopronoun, so while it's popular enough for most people to understand what it means, in my experience "iel" sadly gets a lot of pushback ("oh but we don't do that in French" etc.) which means it's rarely used in contexts other than to refer to non-binary people who have expressed a preference for "iel".
Well it wasn't funny, it came off as off topic at best and borderline queerphobic at worst, and queerphobia doesn't fly here or on blahaj.zone at all really.
My joke may have been bad or dumb to some people but it almost certainly didn't come off as queerphobic.