Male entitlement to female biology regardless of the feelings of the female in possession of that biology; male beliefs about female people having no right to gatekeep access to that biology, or to bodily autonomy; male beliefs about female consent not really being a thing; male beliefs about the way to really piss off another male is to penetrate a female those males see as owned by the male.....
The history of rape in a nutshell. Corrective rape: males raping females to punish or convert them. Rape as a war crime. Marital rape, where a female's right to say no only made it into law a few years ago. Date rape, with all the fun drugs. Rape when a female is drunk, incapable or asleep where the male (that lovely one at the American Uni) is then let off, even after abandoning the raped unconscious body in the street, because gosh wouldn't it be sad to damage his career over a silly thing that any man would understand.
Jeez.
Yes, there is male on male rape. But we're talking about a tiny percentage compared to the whacking great elephant cavorting about in the room, that the trans lobby really hate.
Females are female because of female biology.
Females in possession of female biology are constantly at risk all their lives from a male who feels like taking it, and many experience this. Including the poor transman who sobbed to their rapist in a taxi "but I'm a man!" How females feel about this or identify is utterly irrelevant to the rapist because this is about male entitlement to female biology.
And what you're seeing storming away on Twitter is male entitlement to women's language, realities, lived experiences, spaces, all based on that same underlying belief that females are not entitled to own anything or say no to males.
Oddly enough all those people know the exact sort of women they apply this entitlement to, and it's all the ones with female biology.
The tantrums in this case are about nothing more than female people refusing to lie nicely and prioritise male people's feelings, and saying female people are a thing, with specific issues to do with being female. Because quite obviously, the most important thing when female people talk about the huge, massive, whacking, worldwide very seriously problem with female rape, is not whether male born people feel included.