Here is a (partial?) list of genders available on Facebook. They include:
- Gender Fluid
- Gender Nonconforming
- Gender Variant
While you might be able to claim to be Genderqueer in San Francisco in 2017 and Neutrois in Portland in 2019, I don't think you'd get very far telling the people of Nanking in 1928 that you were Pangender. Further, I doubt that any of the above would be recognized as legitimate in Nairobi in any year.
A characteristic that dissolves as soon as you step off an airplane is no characteristic at all.
A characteristic that can vanish next year because society changed its mind is no characteristic at all.
And remember as you watch the hilarious video below, all cultures are equally valid.