There is principle of the matter and then there are exceptions.
We say that women can give birth. That holds true in principle even if there are those who can't due to biological failings.
But to say "you can never be a real woman, because you can't give birth" would be very silly, given how many "real women" can't. And yet that doesn't stop the terfs.
But to say "you can never be a real woman, because you can't give birth" would be very silly, given how many "real women" can't. And yet that doesn't stop the terfs.