In my experience, the conservative side of it tends to be reductive like that, trans advocacy has been getting better at including intersex advocacy as well because the two groups have overlapping needs. I mostly mentioned it because it was interesting and relevent though.
I got my numbers from Amnesty International.
Myth 2: Being intersex is very rare
According to experts, around 1.7% of the population is born with intersex traits – comparable to the number of people born with red hair.
The person you’re replying to is wrong, translating the word as gender makes the most sense here. That said, sex isn’t strictly binary ~1.5% of people are intersex, which means when they’re born, they don’t fit the typical definition of male or female.
Alright, lay it out for me. What am I debating against then? I will try to give a nice thorough answer.