i would go to the door and stand outside it. are you not a parent? you ask questions like someone who has never raised kids. (not an insult, just an observation). most stores have a family room now where you can be in the room regardless of gender.
maybe the thing here isn't vilifying it's being able to tell who is different easily. before you wouldn't know who is a pervert, but now transgendered people stand out like a sore thumb?
alter (something) from its original course, meaning, or state to a distortion or corruption of what was first intended.
"he was charged with conspiring to pervert the course of justice"
synonyms: distort, corrupt, subvert, twist, bend, abuse, misapply, misuse, misrepresent, misinterpret, falsify
"people who attempt to pervert the rules"
a person whose sexual behavior is regarded as abnormal and unacceptable.
transgendered people are altering something from it's original intention. their sexual behavoir is also considered abnormal and unacceptable (although that seems to be changing).