Sometimes you’re better off letting the children fight.

That was President Trump’s callous wisdom on looking the other way as the Russians and Ukrainians continue to kill each other. But it might better be applied to Trump’s social media spat with Elon Musk. It’s hard to think of two puer aeterni who are more deserving of a verbal walloping.

Their venomous digital smackdown fulgurated on their dueling social media companies, flashing across the Washington sky.

In March, Trump showed off Teslas in the White House driveway and bought an over-$80,000 red Model S. Now, he says he’s going to sell it.

Thursday was the most titillating day here since the sci-fi classic “The Day the Earth Stood Still,” when a spaceship landed an alien to warn human leaders to stop squabbling like children, or the aliens would destroy the Earth.

On Friday, Trump tried to convey serenity. “I’m not thinking about Elon Musk,” Trump said aboard Air Force One. He added, “I wish him well.” But Trump then jumped on the phone to knock Elon, telling ABC’s Jonathan Karl that Musk has “lost his mind” and CNN’s Dana Bash that “the poor guy’s got a problem.” Trump had to know that would be seen as a reference to the intense drug use by Musk chronicled by The Times.

As Raheem Kassam, one of the owners of Butterworth’s, the new Trumpworld boîte on Capitol Hill, assured Politico, “MAGA will not sell out to ketamine.”