I agree Sideways, I think it's the likes of Owen Jones who've really made me resent people who think like this.
Calling people thick is not a vote winner, see Brexit as an example. I was a remainer but hate the implication that ANYONE who voted leave is either stupid or racist. It's too simplistic.
It's also the same school of thought that has led the Labour Party to dismiss women from the party who believe women can't have penises and to say that wanting women and girls to have sex based provisions is a bigoted position.
I'm not madly keen on the Tories, and have never voted for them, it will take me a LOT to get over the lies of Boris Johnson BUT they haven't the arrogance to call potential voters bigots or stupid.
The Labour Party has a lot to sort out to regain my vote. A great start would be to acknowledge the biological reality of 51 % of the population. But as someone said upthread, perhaps Sir Keir is a true believer, in the face of all of the evidence of the harm of self ID and the damage to children of 'trans healthcare', it is starting to seem the only likely explanation.