As a mathematician, this is far from my experience of actual professional mathematicians, because they encounter people much smarter than them quite often. Maybe more true among graduate students, however.
In contrast, I studied chemical engineering for a short stint. First year, first semester chemistry classes and labs were riddled with these types of students. Tell you you're wrong, IQ 197, scoff when you ask a question, etc...
Listen, if you're the smartest person alive that's fantastic, but please don't talk down to me or the mere mortals that I prefer to hang around with. We get along much better and have a lot more fun saying "I don't know, let's find out".