Well, that's what I mean - why would folk be scathing towards lesbians who choose not to have sex with people with male genitals, even if those people identify as women? Why would a trans person not want to have a body which matches what they feel inside? If I say tomorrow that I'm a man can I join one of those all-male sports clubs, even though I have a woman's body?
I need some help in understanding all this. It all seemed pretty clear to me before - there are straight people (now called cis), there are gay people, there are bi people, there are intersex people, there are trans people. When i was a younger adult, we didn't know much about trans people. Now we have TV shows about trans people ("I am Jazz", for instance), the topic is mainstream, if you like.
But there's new nuances every day, it seems.
edit - when I was working, I used to approve special funding for trans people who were seeking surgery on the NHS. They invariably had very long and anguished histories, and all they wanted was for their body to match what they felt inside. That's what I understand and recall when I read about trans people.
By the way, when I wrote above about trans women and giving birth, I mean that they can't physically give birth because they don't have the biological ability to get pregnant, not that they shouldn't be allowed to do it if science ever makes it possible.