Nonbinary AFAB here.
Despite being very much not a girl, I've never used restroom spaces for the opposite sex.
One of my best friends is trans female, and playing through this really helped me to imagine what that situation might be like for her-- and just in general, the awkwardness of the world seeing you as a different person than you really are, and possibly even being seen as a threat. It stings. It stings hard, thinking that she has to go through this. And that I probably will as well, as I transition.
For those brave people who choose to use the restrooms that validate their identity, and for those who don't, you are valid. You are worthy. And you are wonderful.