Wake--
Regarding your annoyance toward transgender M to F people. Does it matter if it's "scientific"for a person to do whatever is needed to feel happy and true to themselves?
As long as it isn't hurting that one or you, why would it annoy you?
Honestly, and with respect to you, I am not going to derail this thread into a discussion about this, so I will share one thought and leave it at that.
People have the right to do what they want to themselves. It is when they do this, and then claim it as scientific, that it becomes an issue to address. As long as you do not make claims to scientific fact—and this includes the religious as well who do attempt this—you may do whatever you wish to feel happy and true to yourself so long as you are not hurting anyone else.