I don't have a problem with people who truly believe they were born in the wrong body. However, the issue I do have is that I believe when a man who believes he is truly a woman or a woman who has also felt lille a man should't imo, have the right to lay claim to those experiences. It undermines how society treats men and women.
For example, who a trans woman ever know what it's like when you first get your period? How about how scary it is when you first realize it is scary to walk in an alleyway without your parents in fear that you will get raped? How about what it feels like when you first develop breasts in school, and you hunch your shoulders because you feel that every boy is looking at you?
For the the trans men, do they know what it's like to have to prove yourself at school, by bullying or do something they don't want to do, like killing a bird, for example? What about masturbating for the first time? Having your voice change and being embarrassed by it? The fact that in some countries you are expected to join the military and go to war? The fact that you have to "suck out up", "man up", "sack up" ?
Obviously, some of these things can be experienced by both sexes, but to grow up and be seen as a man or woman by society is an intrinsic part of your life.
It is the audacity of it. I would never claim that I know what it's like to be a black woman or a gay man. Those are experiences that should never dismissed by other people who have never truly experienced it.
Just like, I could never know what it's like to be trans, and not be comfortable with the body I was born into, they should not have the right to lay claim to experiences that biologically, they have never be able to experience.