There are probably sub-conscious patterns of antipathy to transexuality that other non-traditional sexualities don't engender, because widespread sexual counterfeiting would be disruptive to society. We have certain expectations of others that we meet, and TG violates those expectations in a domain (sex and reproduction) that triggers our most ancient and visceral feelings.
If you bit into a steak and found that it tasted like chocolate, you'd be confused and disturbed. Now multiply that feeling by a large factor.
I think there is a lot of truth to this, even though you seem off base in some of your other statements in this thread.
I (obviously) support equal rights and access to life saving hormones and surgery for transsexual people - since I am one myself. Yet, from my elementary knowledge of evolutionary biology, it's long been my suspicion that there is some sort of deeply rooted antipathy towards trans people that is not completely socially constructed. After all, having sex with a trans (pre or post op) person in modern times, or an intersex person (modern or historical times) would seem to work against propagation of someone's genes.
Still, the bigger causal factors in transphobic sentiments are, I believe, socially constructed and rooted in patriarchal misogyny. There are way more (cis) men with violent, transphobic attitudes against trans women than there are (cis) women with violent, transphobic attitudes against trans men.
> TG violates those expectations in a domain (sex and reproduction) that triggers our most ancient and visceral feelings
The only reason to be possessive about someone else's sexuality is insecurity, I think. Which can be very visceral, too, and loves to camouflage itself.
If you bit into a steak and found that it tasted like chocolate, you'd be confused and disturbed. Now multiply that feeling by a large factor.