Gladwell is an entertainment writer who picks facts and writes interesting stories.

None of them should be taken as factual; he cherry picks and often writers stories well after the source material has been disproven.

For example, Gottman's marriage research in blink that could predict divorce with extreme success was an overfit model without a validation set that didn't generalize well.

Yeah this is a very idiosyncratic pet peeve of mine. Wikipedia's pepsi taste test article also cites Blink with the same sense of authority.