There are a lot of myths around trans that seem feasible at first glance, but dont hold up to any scrutiny. And because a lot of men dont want to, or dont need to, think too hard about it assume the myths are true. Especially when women repeat them.
There's the idea of 'intersex' people being between and of both sexes naturally. Therefore trans people become intersex, and should be treated as the sex they are not. But that misinterprets what DSD are, and forces trans onto an unrelated medical condition.
The idea that we've always accepted men into womens spaces, because we know genuine trans. But if that was the case, we wouldn't need trans inclusive signs to be put up in women toilets or trans awareness.
There are a lot of compromises that seem reasonable at first, but unworkable. Trans inclusive women only spaces cannot happen, because there has to be a reason to exclude men for the women space to exist. Adding men back into the group negates the reason for the women only group.
The reliance of the passing trans is very odd. Im not saying it never happens, but so what? The idea that some men pass as women, therefore they have a right to be in women spaces, and because they have the right, all men do?
Again, its reinterpretating the reason why women spaces are allowed to exist. Men transgressing boundaries is one of the reason women only spaces are needed in the first place. Announcing they are going to use the space anyway, is not a winning argument to get rid of womens spaces.