It seems to me he is reading the room - the room being his own party. No it doesn't feel like a great general election strategy but I doubt he's thinking that far ahead, right now his priority will be to keep his job.
We're always saying he only fights battles he can win yada yada and my guess is he's decied that if he tries to fight his own party on this, he will lose. It doesn't matter whether he really believes TWAW, the people he needs on his side if he's going to save his arse believe it. That's my reading anyway.
To the argument that we should fight this from the inside: 'This' is nothing new. I used to hang out with CLP types in the late 70s but didn't join for some time and the reason was their attitude to women was troubling even for those deeply sexist times. 'Stop moaning and, come the revolution, we'll see you right, did you put two sugars in that?' Kind of thing. The issues might have changed but the belief they are entitled to women's votes has not.
So stay and fight and the absolute best of luck to you but please desist with the finger wagging. As for being doing something other than moaning - I hear you, but I'm now wondering if supporting the SDP so they can field more candidates might be a more productive use of time.