Smart people, often times, are miserable people. You see it with dogs, too. That's why your German Shepard is riddled with anxiety every time you leave the house, while your lab is content to lick a peanut butter stain on the carpet for 11 straight hours. This kind of professor is so disillusioned by the rapid decay of higher education that they actually resent today's youth. If they were a neighbor, they'd keep your ball if it rolled onto their lawn. Since they're a professor, they'll answer your questions with an eye roll and make a lot of snarky digs at "The Facebook." Enjoy your semester.