It's practically impossible to pass as non-binary cuz people only think of boy or girl. But, when they see me, they get confused if I'm wearing boys' clothes or an oversized shirt with shorts.
I always say "I'd rather pass as a boy than a girl, even though I'm neither."
Also, I'm just gonna say that I prefer to be called Em cuz it can stand for several names of all genders.
Also, funny story, I was riding on my bike three laps around the block one day, and the second time I passed this guy, he called me "buddy". Buddy is alright with me, and so is person, human, dude (I call everyone dude, lol), and some others.