A born-again YouTuber who retains his anchorman’s baritone, Lemon had come to City Winery, a lounge-style venue on the Hudson River, as part of a speaking tour with the comedian D.L. Hughley, a friend of his. Typically, the 60-year-old lapsed cable host would begin such evenings by serving up the latest news headlines with a Lemonian spritz: heavy opinion, light yuks, have-you-no-decency monologues about “this administration — well, I should say regime” from a man no longer bound by the standards and practices of what he likes to call “corporate media.”