Personally, for me it’s the idea that just because you don’t experience something (dysphoria, or being a gender other than what society expects of you) that doesn’t mean those experiences aren’t valid.
I get sooo tired of the response “I just don’t understand! I love being my AGAB! Why can’t you just get over it?”
What gender is. Most cis people don’t think about it at all, they just live theirs. They don’t even know it’s a free variable.
I wish I understood what gender is :P
At least you know better than most what it’s not! I’d rather know I don’t know than falsely believe I know.