Occasionally, Elizabeth Bruenig unleashes a tweet for which she knows she’s sure to get dragged: She admits that she doesn’t drink. Bruenig, a columnist at The New York Times with a sizable social-media following, told me that it usually begins with her tweeting something mildly inflammatory and totally unrelated to alcohol—e.g., The Star Wars prequels are actually good. Someone will accuse her of being drunk. She, in turn, will clarify that she doesn’t drink, and that she’s never been drunk. Inevitably, people will criticize her. You’re really missing out, they might say. Why would you deny yourself? As Bruenig sees...