Well...read my previous comment. "Transgender" is a mental issue, refusing to accept what their biology says they are. Just because surgery is capable of altering that biology, doesn't change the fact that it was a distorted and imbalanced mentality that gave rise to seeking that surgery.
Anyway, if homosexuality and trannyness are acceptable, what's wrong with bestiality? Or incest? If one is acceptable, then so are the others. Yet, bestiality and incest are punishable crimes. And rightly so.
Or, consider the person who "identifies" as a black woman, even though she was born white and red-haired. That's EXACTLY the same logic behind "identifying" as the opposite sex as you were born with. Being able to choose what we are...you can fill a milk truck full of manure and call it milk, but when it sprays out at the end of the day it's still just a load of crap.