There's no such thing as a lady brain, however much transactivists would like us to believe.
You could see the books by neurologist Gina Rippon for a start, or this study that looked at many studies done on the issue:
https://www.sciencedaily.com/releases/2021/03/210325115316.htm#:~:text="Sex differences are sexy, but,that differ between the sexes.
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"Men and women's brains do differ slightly, but the key finding is that these distinctions are due to brain size, not sex or gender," Dr. Eliot said. "Sex differences in the brain are tiny and inconsistent, once individuals' head size is accounted for."
So it turns out your big or tiny head is more relevant to brain differences than your subjective lady-feelz.
As to the trans umbrella covering everybody from those with body dysmorphia to men with a fetish, well this is what you get when you insist on 'You are who you say you are?'. Which is what certain people on here have done throughout.
This is what Stonewall, Mermaids, and all the other transactivists have demanded. No diagnosis, nothing other than self identifying as the opposite sex. 'It's enough to say 'I am a woman' remember?
Which means of course that you have to accept that every transwoman sex offender and every man with a fetish is as much 'trans' as those with body dysphoria. How can we tell the difference?
Though of course it's perfectly legitimate on occasion to exclude all men, because it's done on the basis of them being men and regardless of how they identify, whether they are genuinely dysphoric, and whether they are harmless or not.