No XXY or XYY or XXX etc. are not new genders. That logic is insane. They are copying errors, akin to other syndromes like Down Syndrome, that usually render the afflicted as sterile if they survive. The one guy I've known you had Klinefelter's would want only to be a normal guy, certainly not a new gender. Oh, you feel awkward about your affliction you can't do anything about? Yes let's draw attention to that, get it out there for everyone to see, focus on it, make it who you are! That's gonna be healthy for them.
Through history there have been effeminate men and masculine women. That isn't a crisis or new gender, it's just a personality trait. A transgendered woman can no more tell you what it's like to actually be a woman than a woman can tell them what it's actually like to be a transgendered woman. Their perception of life is different because their lives are different. I think for many it's just a fetish. Why else do so many dress as some over-the-top attention whore cliches of what a woman is? Look at Dylan Mulvaney. The only real women that dress like that all the time are intentionally sexualizing themselves for money.