"Eschew flamebait. Don't introduce flamewar topics unless you have something genuinely new to say. Avoid unrelated controversies and generic tangents."
You have, at best, a high school level understanding of biology. The current scientific and medical consensus absolutely supports the idea of gender as a more complex system then which parts you have. Everything you've said in the above comment is incorrect.
First, you are not born male or female. There are many, many physical presentations that we loosely bucket and assign babies into.
Second, sex organs don't determine gender. Gender is a social construct.
Third, being trans is not a mental disease. The medical community has moved beyond that definition a long time ago. Body dysphoria is also not present in all trans people.
I know you are speaking from a place of ignorance, but "biology 101" is an extremely surface level understanding of biology but even introductory biology describes the concept of sex characteristics being not being binary. And most introductory biology books will say nothing about gender at all, because it's not a biological concept.
So, your comment is offensive because it claims to be speaking from a place of knowledge -- using biology or science as some sort of evidence of your correctness -- when in fact the opposite is true.
You would know this if you were actually interested in learning about the science, biology, and sociology. So the only explanations I have are either you have a woefully outdated understanding of science, or you are being deliberately transphobic.
In addition to breaking the site guidelines with flamewar (see https://news.ycombinator.com/item?id=26527725 above), you crossed into personal attack here. That also is a bannable offense on Hacker News. No more of this, please.
Trans women are women. Trans women were born men, but they are not pretending.