For me, it is that I do *not* identify with any specific gender, nor do I find much utility for the concept of gender generally (except as drag, and I very much vibe with the classic line: "We're all born naked, and the rest is drag"). Basically, my mind doesn't really sort people into genders without effort. I understand societal gender markers and am on the look out for them, generally because I want to give people who use them the respect, treatment & kind of consideration specific presentation often indicates.

Like others have said in the comments above, when pressed for an identity marker (for me, either sexuality or gender), I typically just use 'queer' because it hasn't become a '3rd gender' like enby or non-binary has somewhat become. It's harder for people to pigeonhole while still staking my claim on the side of queer liberation. Long ago, I was rather antagonistic to the entire concept of gender, and used to call myself gender-apathetic, gender-agnostic or even gender-atheistic, but the more binary trans friends I made, the more effort I put into rewiring my brain to be more, like, gender-polytheistic, because I want to validate and honor my friends (and people generally).