Yeah, I agree. They can be tiresome at times, when they AGAIN misgender you, or ask 'stupid' questions (which are totally nuts from our POV, but completely logical and sane from theirs), but yes, I understand where they are coming from. I understand the whole concept of transgenders is kind of hard to grasp for cisgender people, as their gender is just obvious for them. Like the obvious of all obvious.
I think that maybe a lot of 'cisgenders' might actually be trans, like when I was a teenager (say 14/15) I felt like my body was wrong, etc. but I just dismissed it as 'impossible' and 'crazy', because gender was such an obvious thing, right? I simply thought gender was equal to BIOLOGICAL gender and couldn't be different from what you were born with, I was just a tomboy, a masculine, non-stereotypical girl, because the "GIRL" part was 'set in stone', sorta.
So I identified as cisgender, but only because I didn't know it was even POSSIBLE to be transgender.
When I was a kid I used the terms "girl-girl" "boy-girl", "boy-boy" and "girl-boy", with which the last word was meant to represent the physical appearance/body, and the other the mental identity/'gender feeling'. Now in hindsight I see that was my own way to sort of describe 'transgender' to myself without knowing the 'real' words, etc. (though I also used the term 'girl-boy' for example to describe feminine boys, which could also have been gay or just generally feminine instead of trans, etc.)