Others note: CNN retracted and apologized. Three staff members resigned. Trump himself has been responsible for propagating numerous untruths, from the birther conspiracy around Barack Obama to the claim that millions of people voted illegally in the 2016 presidential election—none of which he's apologized for, corrected, or retracted. His critics say they'll take CNN over Trump any day.
At Slate, Ben Mathis-Lilley points out it's both wildly convenient and rather disturbing the president is telling the world the news media consists of for-profit liars.
Trump is melting down and claiming in an extended Twitter rant that this quickly acknowledged error in editorial judgment on CNN's part proves that everything negative that's ever been published about him anywhere is made up.