I know there were a lot of signs, but the one thing that convinced me Josh is autistic and not merely nerdy is him confessing in an old forum he wanted to be a woman.
I doubt those feelings magically went away. But him having to deal with so many trans lunatics likely soured him on the idea of pursuing them openly. He might had even tried to suppress them. But that's not nothing.
It's likely also why he seems to have a soft spot for Chris' transition. He has felt the exact same. He has even called Chris a 'true trans' because he had signs of wanting to be a woman before wokeness. Again just like him.
But if there's one person that would be eaten alive for doing it is the owner of kiwifarms. This is why I think it's posible he has female socks on the forum with lil drip being a prime supect. It's the only outlet he has for those desires.