In the same way that Christianity or Wicca are real
it's also real that there are people who don't believe than one can be non-binary
So if someone holds the view that they don't believe it's possible for a person to be a Christian even though there's millions of people that call themselves Christian do you think that means the question of whether or not there are people that are Christian is up for debate? That's insane.
And? How does that make non-binary gender any less real? Which is what you implied with your original comment, by asking if it exists or not.
Many things are matters of social practice, doesn't make them any less real.
So if someone holds the view that they don't believe it's possible for a person to be a Christian even though there's millions of people that call themselves Christian do you think that means the question of whether or not there are people that are Christian is up for debate? That's insane.
You're right. It's about whether nonbinary people and trans people in general deserve rights and social validation. Which they do. End of discussion.
:::spoiler Personally, I'm of the opinion that men don't exist. All "men" are just NBs doing it for attention.
(apologies to trans men for this bit)