As you are the author of the piece, I’d expect more from you. Call out culture and ganging up has no place in autistic advocacy for reasons that should be obvious. This is also behavior that I do not see on this site in general.
I suggest checking in to see whether you are in touch with the double empathy problem if you can’t engage with a bluntly stated opinion for what it is.
Whether or not there is room for disagreement over the impact of the word “ambassador”, or for that matter claiming to represent a “culture”, there is no room for this kind of tactic.
From this response, it looks to me like you in fact do see yourself as a specially correct voice in this, and not just someone with a point of view which might be disagreed with.