IMO, humans have either an , "Innie", or an "Outie" set of genitalia that defines their sex, based on chromosomal makeup.
( although there are uncommon instances of what used to be called, "Hermaphrodite", which has what appears to be a combination of both "Innie and Outie". I do not think that term is used very often any more.)
IMO, either someone is an , XX chromosome set(Female), the homogametic sex, or an XY chromosome set(Male), the heterogametic sex.
(Or, one of the rare sets in humans, the presence of the Y chromosome is responsible for triggering male development; in the absence of the Y chromosome, the fetus will undergo female development. There are various exceptions, such as individuals with Klinefelter syndrome (who have XXY chromosomes), Swyer syndrome (women with XY chromosomes), and XX male syndrome (men with XX chromosomes), however these exceptions are rare.)
Based on that thinking, ( MY opinion & shared by a whole lot of folks for a very long time) There are no "Other" "Genders", or "sexes" in humans.
Anyone who thinks otherwise, is also in MY opinion, "Mentally Ill".
Just because someone THINKS they are of some other sort of gender, or sex, does not mean that they ARE another gender or sex.
Even if they have surgery to change their genitalia, they are STILL the same chromosomal set that they were born with, either XX, XY, or some uncommon/rare chromosomal set.
Humans that do have their genitalia changed is not unlike getting a tattoo, a piercing, other bodily manipulations, or even having an organ removed by accident or surgically, or even a limb removed by accident or surgery.
They are STILL BIOLOGICALLY the SAME in regard to their chromosomal set.
I m talking about the REALITY of "ya gets what ya get" when you are born.
Can't change it at the chromosomal level. Might be able to change outward appearances, but the person is still the SAME GENDER they were born with, based on their chromosomal set.
Expecting others to accept the persons mental illness thinking they are of some other gender/sex, as being "normal" thinking & expectations, is ridiculous.
It is also unrealistic to think that just because someone is suffering from a mental illness, that everyone else must go along with that fantasy.
( Not going to go into the mental illness of thinking one is an animal, like a cat, or that BS. It is fantasy & to think it is a reality is a "mental illness" once again.)
Simply put. I am NOT going to go along with someones BS fantasy land mental illness hangup, no way , no how.
Anyone who expects others to accept someone elses fantasy mindset that is ABnormal, is abnormal themselves.
Bet on it, don't be fooled by it.
ETA= Just thought I would add... The above is "MY" opinion. I am not going to change my mind, so if anyone comes here & tries to tell me different, they are wasting their time. Facts is facts. Reality is not Fantasy, and Vice versa.
