Are all trans women dangerous predators? Of course not.
Only some trans women are dangerous predators.
Just like only some men are dangerous predators.
But nevertheless we exclude all men from women's spaces.
So by the same logic we also exclude those men who are trans women. This is not dehumanising the men who are trans women any more than it dehumanised the men who are not.
What you are asking for is that we give the men who are trans women special access that the men who are not trans women don't get.
But if you accept the legitimacy that women's spaces exclude all men because so e are problematic, you cannot then use the argument it is demonising to exclude all trans women because some are problematic, because by accepting wonen-only spaces in the first place you already accept the general concept.
So uf you want to argue for the men who are trans women to have access to women only spaces you can only base your argument on their being actually women rather than men, and no one has yet been able to make that argument from first principles, only from some form of "well they say they are women, and as long as the word women doesn't actually mean anything that works", which is obviously no argument at all.
Are all trans women deluded? I don't know. But 100% certainly all trans women are sexist, because the belief that the fundamental and defining difference between men and women is that our minds are different, and all the shit that happened and happens to female people because of our physical sex isn't relevant to being a women or to the existence of women's spaces and women's rights is sexist as fuck.
Which is what David Tennant also is for nodding along to it and attacking women for calling it out.