Sending good vibes to all of my trans comrades 
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The idea of "biological support" seems to be overly black/white thinking imo. Just another way of talking about "nature vs nurture" when its usually more of a "nature & nurture" for everything (although questions of how much observed variations occur to observed variations in inherited factors vs pre-birth environment vs post-birth environment are essentially still looking at trying to look at the same underlying question of "nature vs nurture" without making it a binary).
So I don't really mean to talk about the biological support issue. But if its the intersection of autism and gender, then whether agender can be explained as a biological would depend on your explanations of autism and gender.
Yes that was my thinking too :3 I wasn't a big fan of the concept either, hence my annoying hammering. And yeah that's pretty much what it all comes back to, Idk I just did not dig "biologically supported" as a concept.