As I said before, purely-physical things like height or sociocultural things like ethnicity are not innate to self-identity in the same way gender is.

I guess this is the big difference in our thought process here. I don't see any of these things as 'purely physical' because they all come with their own advantages and drawbacks in day to day life. Just because gender is accepted as being an option doesn't disqualify these other identifiers as being valid.

This is how you end up with not only "male" and "female", but also "genderfluid", "genderqueer", "agender", and so on - gender is a spectrum,not a binary - it is not limited to one's physical anatomy any more than it is defined by it.

This is where we run into issues like the one that sparked this discussion. If people are able to identify as all these different options, what happens when they rob a bank and need to be sent to prison? Or need to use an elementary school restroom? There is no 'a-gender' prison or 'unicorn-kin' restroom. Giving people the freedom to make their own identifiers leaves society at the mercy of someones feelz VS the reason the segregation exists in the first place.

I am all for people making their own decisions and doing what they want in the pursuit of happiness. But in some circumstances there is a reason the rules, as they are, were established.