Actually, re-reading this I realise you misrepresented or misinterpreted what I said.
Ironically, I actually agree with the statement as you make it.
What everyone else feels is completely irrelevant to whether or not someone is trans. This is very much true because of course the trans person has no idea what everyone else truly feels.
Because trans identities are based, as I said in my initial comment, on what the trans person believes everyone else feels, not what they may actually feel.
And therefore, because the trrans person has no idea what everyone else truly feels, only what the trans person believes they feel, despite TRActivist's feverish demands there is simply no basis on which it is justified or appropriate to adjust the trans person's body to be "more like" that of the opposite sex, nor to allow them cross-sex privileges or privileged access to the opposite sex, simply because of what the trans person happens to believe about the opposite sex.
Because in reality, as you yourself agree, whatever it is they believe other people are feeling has nothing whatsoever to do with what those other people actually feel, and therefore it does not in any way justify treating the trans person as if they actually are closer to the opposite sex, in mind, feeling or body, than anyone else is.
So, like I said in the post you took exception to, trans people are not necessarily confused, but they are simply wrong in their beliefs about other people.