I think with teachers and professors it can be a case of "habit".
They're used to being the smartest person in the room and telling the people around them what's what. This can sometimes rub off on interactions outside work. Same kind of thing can happen with other professions, of course.
They're used to being the smartest person in the room and telling the people around them what's what. This can sometimes rub off on interactions outside work. Same kind of thing can happen with other professions, of course.