Er, I'm not exactly sure what you're asking about, but I'll try to explain...what I'm talking about here is the use of marked and unmarked categories in classifying people. "Unmarked" people are considered "normal," and their gender/race/sexuality/etc goes unquestioned. It isn't used to define them as a person. But people in the "marked" category are often thought of or treated as more "X" (where X is any of the following: female, non-white, queer, disabled, the list goes on) than they are "human."

I'm trying not to get too deep into the philosophy and politics of it, though, because uh, fandomsecrets is not the place. Also, I have a headache right now. :/ So this probably isn't very clear.