While the idea of a gender fluid inclusive tolerant community has some merit, it is not based on our reality. We still need some boundaries. Boundaries and definitions are there for a reason-otherwise your neighbour may build an extension to his house on your driveway, just because he doesn't recognise your boundaries.
Definitions are there for a reason too.
If you cant define define something, be it a woman, you cant define what is not a woman. we as people are roughly half male and half female.
Gender is not real, biological sex is. Biology is visible, measurable, repeatable. Gender is whatever the person desires. I believe a study at the BBC some time ago found that there were over 70 different genders working there. To rely on that to plan public services, health services, benefit services etc. is the path to madness. Each group has different needs. Its no good inviting a woman for a prostate examination or a man for a smear.