“Behavioral economics" is still economics, but it is economics done with strong injections of good psychology and other social sciences.
Early in my teaching career I managed to inadvertently get most of the students in my microeconomics class mad at me, and for once, it had nothing to do with anything I said in class. The problem was caused by a midterm exam. I had composed an exam that was designed to distinguish among three broad groups of students: the stars who really mastered the material, the middle group who grasped the basic concepts, and the bottom group who just didn’t get it. To successfully accomplish this task, the exam had to have some questions that only the top students would get right, which meant that the exam was hard. The exam succeeded in my goal—there was a wide dispersion of scores—but when the students got their results they were in an uproar. Their principal complaint was that the average score was only 72 points out of a possible 100.