> I don't know anything about the birth genitals of most people I dine with. Unless you mostly participate in statistically unusual social circles, that's plai

> I don't know anything about the birth genitals of most people I dine with. Unless you mostly participate in statistically unusual social circles, that's plain incorrect. The truth is that you can't know anything about their birth genitals with certainty. However, unless you have some unusual condition that prevents you from perceiving sex-associated characteristics, then if somebody looks male/female to you, you know with very high confidence what their birth genitals were. One can quibble about the exact level of confidence, and it depends on what social circles you self-select into (because that affects your base rates), but for most people the certainty is fairly close to 100%. Of course that may not be the lived experience of people who are trans themselves, because of who they associate with, and that may contribute to some of the unnecessary vitriol on the topic In any case, what matters is what you do with that knowledge.