As a teacher I was asked by smirking seven year olds, 'Are you a girl or a boy, Miss?', to which I replied, 'Neither.' but the real question is how to make this small ask irrelevant.
Trans-women might also please consider that if to be trans is not a bad thing, which it isn't, there should ideally be no problem in being called a trans-woman. Clearly the world is not ideal but the fault is with society's prejudice. Let's resist it?
It is unfair to demand feminists embrace declared faith in inner gender difference but not expect trans-people to embrace that some people validly don't take it as axiomatic truth. As long as we are respectful it can be left undecided.
We need a more sophisticated synthesis - the spectrum of feminine/masculine is deeply complex, and may depend on a balance of hormonal, chromosomal and social environmental factors, but in any case it is a social straightjacket.