I’ve noticed that people who go to a name brand university, and even those who who go to a lower tier college but take a more demanding course of study, like, say, engineering, tend to be dismissive of other people’s opinions and reasoning.
Here is an excellent piece (written in 2008) which explains that phenomenom, and more:
My education taught me to believe that people who didn’t go to an Ivy League or equivalent school weren’t worth talking to, regardless of their class. I was given the unmistakable message that such people were beneath me. We were “the best and the brightest,” as these places love to say, and everyone else was, well, something else: less good, less bright.
Of course, people who think they know everything are particularly annoying to those of us that actually do.