they'd show up drunk. lament about how they're wasting their lives with children. complain that they didn't have enough time for their work.
math probably self-selects for introverts, but it can't be much different than other fields.
this is a part of the reason why i'm an advocate of converting the university system into four extra years of high school, and leaving the universities as research institutions: to emancipate professors from the doldrums of teaching.
the most miserable people i've ever met are profs. you spend enough time around them, you learn the lesson: get out while you can.