femininity and "fuck you"

as someone who grew up in utah (southern utah, to be more precise), i did not have the privilege RIGHT of receiving a scientifically accurate or particularly feminist sex education.  i took psychology 101 from utah valley university as a concurrent enrollment course in high school that persistently used "sex" and "gender" interchangeably.  i would later take another psychology course in my first year of college that effectively did the same thing.  i was trying to work through my gender/identity issues at the time and this was less than helpful, although i was oblivious to why that would be a problem.
it was only when i entered almost exclusively feminist circles that i then learned the difference.  and then my identity started to make more sense.  now i have a hard time trusting anyone who makes this assumption.  it's harmful to education revolving trans and gender nonconforming identities.  it's confusing to the trans and gender nonconforming people themselves.  it reinforces biological determinism, which suggests that your biology determines your identity.