strip-away-my-conscience:

If you don’t believe non binary genders exist, that’s ok!

As long as you aren’t going out of your way to upset or harrass someone who says they are non binary, you’re fine!

There currently isn’t any scientific proof behind non binary genders so not believing in them is completely logical.

Please stop harrasing harmless people for not believing in them! You do not have the right to attack someone for the simple claim that “non binary isn’t a thing” if they aren’t being a dick about it, that opinion is ok!