thats what headcanons are. i dont need proof. but since you ask- can you disprove that hes a trans man??? can YOU prove he isnt one??? it literally can't be done, and there's a lot more to suggest he is than isnt, which ive written about here:
@diehardsherlockian

Marcelock 08/15/16
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i love my trans son Sherlock
what's going on over here on this day
Horrors
Well you're talking about it like it's absolute fact so I was just curious what evidence you found cause I definitely missed it v
amen