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Trans people aside, there are people who are purely biologically not XY-male or XX-female. You can have X, Y, YY, XYY, XXY, and XXYY. And more, but the further you get from a pair, the lower the viability. Not to mention things like hormone insensitivity, where you may not develop primary or secondary sexual characteristics, or having sensitivity and developing too much in a certain way.
It's all very complicated, and honestly when it doesn't affect me I don't worry about it. Let people live their lives the way they want in peace and everyone will be much happier.
Thanks, I appreciate the information.
Something I've learned that complicates it further is that a single person doesn't always have consistent chromosomes throughout their entire body. It is entirely possible to have an XX liver or brain or any other organ while the rest of you is XY. It is called microchimerism, it can happen when some stem cells from a baby get into the mother and start to develop as one of her organs. It can also go the other direction, so anyone who formed in a womb can have it. Generally, people have no reason to be tested for this, so most people have no idea if they have organs like this or not.
Quick correction, you cannot have just Y or YY. The only full monosomy you can have and survive is Turner syndrome (just one X). Not having any X chromosome is 100% fatal, the X chromosome is necessary for development regardless of sex. Additionally, while you can have XYY (Jacobs syndrome), you cannot have YY for the same reason you can't have monosomy Y.