Westminster is often accused of operating in its own bubble. If only all of its MPs were always that honourable. For the prime minister’s statement on his latest Brexit proposals, the sparsely attended government benches appeared to exist entirely in a vacuum. Both actual and moral. Deprived of oxygen and any contingent sense of reality, the Tories hallucinated a parallel future. One in which the party had reunited behind an impossible dream. Where the past was not so much another country, as another planet.

At the cabinet meeting in the morning, Boris Johnson had promised colleagues he would be a model of “gelatinous emollience” towards everyone, including Labour MPs and the EU27. And he was as good as his word. There was no talk of surrender and traitors, no childish tantrums, just lavish displays of courtesy. Except Boris just can’t do sincerity. His whole act is based on a lack of moderation and the time to worry is when he’s being nice. That’s when you know he’s lying. Even more than usual.

Conservative MPs know as well as everyone else that the Incredible Sulk is a fraud. It’s just that he’s their fraud. The love affair in which a sexually transmitted disease is already priced in. They know that the new deal is dead on arrival. That a double border, customs barriers and a de facto DUP veto break all the EU’s red lines – not to mention the Good Friday agreement – but they go along with it. Just for the craic.

“May I congratulate the prime minister on his brilliance?” said one Tory MP after another. Johnson merely affected an air of false modesty, insisting that the brilliance was all theirs for recognising his own. It was as if Boris had solved the mystery of time travel by coming up with a fantasy proposal, whose sole purpose is to unite the European Research Group and the DUP and command a Commons majority with the help of a few Labour MPs who are now so desperate they will now sign up to just about anything. Even something worse than the deal they had already voted against.

Graham Brady was quick to remind everyone that the Graham Brady amendment on which the new proposals were based was named after him, Graham Brady, and he would like it on record that he, Graham Brady, was just happy to have played a minor part in the historic Graham Brady process. Geoffrey “Mad Dog” Clifton-Brown, newly released from house arrest after the tense International Lounge siege at the Tory party conference, promised he’d take out anyone who dared vote against it. Even Steve Baker and Mark Francois, the Mark Thatcher and Simon Mann of the ERG, managed to forget that the new deal still had many of the features they’d really hated in the old one, and declared their undying support for whatever needed undying support. So brave.

All that was missing from the Tory love-in was the voice of the DUP. Principally because no DUP MPs were in the chamber. They had all quickly nipped back to Northern Ireland to bank the latest £1bn cheque the government had handed over in return for their support. Brexit was turning into a nice money-spinner for the DUP. Especially when all they have to do is put their name to a deal that’s never going to materialise. It’s like being bribed to support the Flat Earth Society. It shows the state we’re in where the only deal that can find a majority in parliament is the one that is categorically never going to happen. Yet again, Brexit makes fools of fools.

Theresa May listens to Boris Johnson in the Commons. Photograph: Uk Parliamentary Recording Unit Handout/EPA

Throughout all this, Theresa May sat motionless on the back benches. Her face a rictus of misery. This was a deal even she could have got through parliament. But she had had too much integrity to insult the EU with an offer she knew it was bound to refuse. After an hour, even someone of her almost limitless masochistic reserves had had enough pain. With a quick glance of pure hatred at the prime minister, she stalked out. Alone as always.

Not that Johnson cared. He could do the Mr Nice Guy bit just as easily as The Joker. It was all an act anyway. He had no core principles to compromise. Just narcissistic ambition. Brexit was just another play. If the EU was stupid enough to accept his deal, then job done. If it didn’t, then so be it. He was just as easy with a no deal or being forced to ask for an extension. Either way, he had set it up for those EU bastards – sorry, friends and neighbours – to take the blame. Everything was just collateral in the greater scheme of Project Boris.