Interesting thread.
I am also surprised to see some scientists espousing the fuzzy and feelings-based TRA view of human sexual dimorphism, disregarding centuries of scientific knowledge in favour of "inclusivity".
As @Shedbuilder and @Bertiebiscuit said, this is comparable to any belief system that is built on hearsay and subjective feelings. Belief in gods and/or religious dogma is the most obvious example.
Just like womanhood doesn't become a fuzzy feeling in all our heads just because some males feel or experience that makes them think they are women, @Babdoc's deity doesn't actually exist because he had a feeling or experience that made her think she had a "personal encounter". And @Shedbuilder isn't "impolite" to say that having some kind of "experience" that only you have witnessed is not evidence of something's existence. It is a fair and rational comment, which you would have also thought to say as a medical professional, if a patient told you that they saw aliens or talking grasshoppers.
I have met pharmacists who recommend homeopathy, although you would think that knowing a solution actually loses its potency as it's heavily diluted is basic knowledge at whichever school they got their diplomas from. Unfortunately, having a science diploma and working in a scientific field does not mean that one always looks at the world through a scientific lens and verifies all new information/experience against the body of their scientific knowledge.
And those of us who are not scientists can be very scientific in how they perceive and evaluate their world. If I had a "personal encounter with God", I would not presume to have discovered the answer to one of mankind's oldest questions just because I had a feeling in my head. I would seek medical help, suspecting the sudden onset of a neurological disorder presenting with psychosis, a brain tumour, or a stroke.
That is exactly what happened to brain scientist Jill Bolte Taylor, incidentally. In her auto-biographical book My Stroke of Insight, she describes an "expanding sense of grace" where her "consciousness soared into an all-knowingness, a 'being-at one' with the universe".
She was having a stroke.