I only recently managed to convince the more reasonable and less religious of my two parents that it's pretty likely I have Autism and ADHD, given the extensive amount of signs of it throughout my life.
Though the rest of "me" I've had to keep hidden unless I want the more religious and less reasonable one of them to have a field day due to their regressive beliefs. Because, you know, being a Autistic ADHD Asexual Aromantic sort-of-gender Apathetic Furry, (I'm probably missing something here) or AAAA as I sometimes comedically shorten it to, doesn't exactly line up with their ideals about many things.
As an Asexual, can confirm, they're just making a joke with a text based stutter, not referring to Asexual or Agender, such as in "LGBTQIA+" that generally refers to multiple things under the "A".
In the latter case, it's left open ended for inclusivity, rather than arbitrarily excluding other things by specifying.
As for how the original comment could possibly be more inclusive, it's harder to say exactly, but I can think of something like "Ladies, Gentlemen, and everyone else", but I'm not exactly great at fancy words... or words in general... but I try my best.