The Weather and the Words in Passing : Page 229
These things, too, ought to be remarked on at the beginning of any party, that is, as soon as the circumstances permit. But it is important to stress that one comments on the favorable items; not on anything unfavorable. You should not say, "I heard you were demoted. Too bad" or "I see by
the promotion list that your son failed in school" or "Too bad about that suit for debts against you." One does not allude to unfavorable items, unless they are of such common knowledge that not to do so would seem to be avoiding them purposely. If someone's brother shot a neighbor and all the papers carried it, then, on meeting, you may frankly say, "I sympathize with you about the tragic publicity that indirectly fell on you."