Well, I am a clinical psychologist and an educator. Oh yeah, and I also live in Vermont. I'm not organizing LGBT rallies or anything, but it is an issue that I encounter frequently in both my professional and personal life. I receive a great deal of professional development/training on the subject, work with these people first hand, and know and interact with these people personally.
It is not untrue to say "if you have a Y you're a guy." That's just a fact. It is dismissive and flat out ignorant, however, to attribute all cases of gender confusion/fluidity as mental illness. That blanket assumption couldn't be further from the truth based on my professional and personal experience. JMO