My theory—call it the “Oakley effect”—is that really smart people often don’t know how to accept and react constructively to criticism. (A neuroscientist might say they “have underdeveloped neurocircuitry for integrating negatively valenced stimuli.”) This is because smart people are whizzes at problems that only need one person to figure out. Indeed, people are evaluated from kindergarten through college prep SATs on the basis of such “single solver” problems. If you are often or nearly always right with these kinds of problems, your increased confidence in your own abilities would be accompanied by an inadvertent decrease in your capacity to...