While Barack Obama was speaking about “call-out culture”, I watched the young woman chairing the meeting. Although she was hosting America’s revered only black president, father of her Harvard friend Malia, Yara Shahidi didn’t nod when Obama said “the world is messy: there are ambiguities” or that scolding, “woke” tweets alone won’t bring change. A generational divide was reflected in her beautiful, nonplussed face.

Because Obama’s criticism of a modern left activism based upon social media “pile-ons” was widely applauded by the over-30s. If you don’t believe us, cried all we centrist mums and dads, maybe you’ll listen to Mr Hope-and-Change. He too thinks “people who do really good stuff have flaws”, that smashing things up is the easy part. (Although, if seeking the Democratic