First, drop the condescending attitude. Second. This is what you said that I responded to. What is a Kleinfelter male, chromosomally speaking? What is XXY? What if the SRY is translocated and you have an XX male? What about an XXX female?
Biological sex is fairly rigid but there are exceptions. In the event of these exceptions, you often find altered brain chemistry. In the case of transgender individuals, or homosexual individuals, differences in brain chemistry can be and/or are observed. From this vantage point, it’s a lot easier to understand how gender is closer to a spectrum than the concept of biological sex.
This dude probably struggled with two trait punnett squares but wants to go waist deep into a discussion about one of the most scientifically intricate topics in biology…
Under the law YOU would support, this person will be legally REQUIRED to use the women’s restroom. You’re totally fine with that? (That is one “less feminine looking woman”, I’ll give you that.)
To be clear: I’m not suggesting in any way that this person is a threat to my kid. Quite the opposite. They’re just looking to use the can.