More like Man, Woman and 60 plus different other categories even good sports in the first two categories don't tend to be bothered to learn about.
It's not that it's secret it's that if you don't ask for specifics we assume you don't care, don't know there are specifics or you really just don't want to know.
Us Enbyfolk respecting that you probably don't need to be burdened with actual specifics or interpreting that knowledge as being additional social pressure is us being polite.