Thanks for the clarification. I was pretty sure I understood "non-binary", but I was just guessing. Had to look it up. One definition I found was "not relating to, composed of, or involving just two things."

In this context, I'm taking it to mean that people don't see gender as an either/or thing. Maybe it's someone saying they have many female qualities, but also a few male ones and doesn't want to identify solely as one thing. I think that's actually most of us, because many qualities we assign to a specific gender just ends up that way because people believe it should be.