You've set up a false dichotomy between "polite ignorance" and mean-spirited correction. I don't think that the OP is suggesting that Yehuda shouldn't have cor

You've set up a false dichotomy between "polite ignorance" and mean-spirited correction. I don't think that the OP is suggesting that Yehuda shouldn't have corrected the presenter, but that he should have done it in polite way, i.e. "Have you considered doing it this way instead." People (like the presenter) are far more likely to respond positively and learn from someone who "teaches" rather than someone who ridicules that person for their stupidity.