@masukomi There are multiple people close to me who describe their gender as "trans" as if it's a noun, not an adjective modifying a noun. Words literally mean what people use them to mean.
Maybe don't presume to speak for others, and especially not if your profile says "trans" and not "trans X" whatever that "X" might be. It somewhat undermines your point, no?
If you want to point out how tick boxes are often woefully incomplete for expression gender, please do so, but maybe in another way.