I didn't find the original inaccurate statement so surprising. People have imprecise memories of details of weather and geography. I know I do!
But the response to making a mistake reveals the man. A person might be stubborn. But to make a sharpie-adjusted chart to pretend you were right is the mark of a relentless, shameless, rather pathetic liar.
He's not like any child I have ever known. And thank god for that.