The vast majority of people can identify other people's sex; so why the pretence that men are women?

Yes. I mean obviously a set of stereotypes and roles which arose for some mysterious reason are more important than the completely unrelated inconsequential fact that humans are one of two reproductive, dimorphic types.

I don't think the idea is that you can't tell. It's that you're meant to think that the idea that "man" and "woman" relate to sex is outdated and wrong, because they now mean "Which set of societally determined gender stereotypes do you feel suit you best".

Which obviously is far more important to determine in sports, relationships and places where people are vulnerable, than silly old biological sex.

They treat us like we are stupid and I find that insulting.

I suppose what's going on depends on whether a trans person is projecting their self-image outwardly or projecting it inwardly. Is it to convince others or does that not matter because the performance is for the performer's benefit?

We've just passed the 8 billion mark for the number of humans alive right now so the bleating that you can't always tell doesn't work in the slightest. If some people want to pretend to be stupid call them out on it or (better yet imo) laugh at them. Don't indulge it. Everyone knows the difference.

I am honestly amazed anyone thinks that video isn't a sham. Poorly scripted and acted. It's also a deflection, but ok. Even though I know it's a lie because lone women don't challenge (because men are at their most dangerous when women say no, and in an enclosed space to boot), if men weren't making womens facilities unsafe, women wouldn't feel the need to challenge gnc women.

There's a lot to be said for who is doing the observing. I think the vast majority of people know, but maybe men less so? It isn't an important survival instinct for men, plus they are more like to judge based on basic qualities like hair length or breasts.

Women take in scent, gait, feet, hands, shoulders, hip to waist ratio, jawline, browbone, and hairlines, almost instantly, all of which are such a giveaway. The idea that untold numbers of men are passing would be laughable if it wasn't such insidious bullshit.

It's so insidious. We're being asked to ignore our basic instincts that we rely on for safety. I'm not colluding in a sinister lie.

I thought that video had been debunked as fake. It certainly came across as a badly acted, badly scripted college piece for media studies. Any faces or names yet?

This is the inverse of what is under discussion, which is women's ability to correctly identify males who are trying to present as women.
The fact that a woman was apparently mis-identified as a male is a different issue.
Incidentally there has been much comment about that video, especially regarding the sobriety or otherwise of the woman calling out the other woman, plus its poor quality and lack of images...

Not always

www.mumsnet.com/talk/womens_rights/4665955-cis-woman-harassed-in-womens-bathroom-by-a-gender-critical-woman-who-thinks-she-is-trans-she-is-upset-by-the-experience

Everyone knows and everyone must play the game or else.

Quite. We're supposed to believe that loads of "women" are using our spaces and being called a she etc, all the while having a penis but no one can tell.

It's a myth. It's all part of the ideological belief system.

"You can't tell" is gender ideology belief number 3.

The most convincing cases of "you can't tell" are in transmen, but only really on screen. In real life TM are very feminine and short compared to men. In TW it's usually obvious what sex they are.