Froedtert Hospital has been named a 2017 Leader in LGBTQ Healthcare Equality by the Human Rights Campaign Foundation, the educational arm of the country's largest lesbian, gay, bisexual, transgender and questioning/queer civil rights organization.
Indeed, the data presented here confirm that dude is an address term that is used mostly by young men to address other young men; however, its use has expanded so that it is now used as a general address term for a group (same or mixed gender), and by and to women.
If gender is largely a social construct, why would someone identify as transgender? It seems to be that while sex is a biological/anatomical descriptor for male/female, that gender is a descriptor for the more subjective masculine/feminine distinction.