I get the aversion to the title from the offset but it's the point of the speech. He talks about how, when you're born, the doc declares what gender you are based purely on what's between your legs and how that follows you. So basically the idea is that some boys are born [declared] a girl. This is why, in terms of the body, I prefer the term female and male, and in terms of gender identity you can identify as girl or boy based on your brain; not genitalia/body parts/hormone composition. We can be born female, but that doesn't mean we're girls.