There's a Buddhist saying about annoying people being the best teachers, because we can use our encounters with them to practice patience and compassion. After all, nobody sets out to be a jerk. Usually we're just seeing the result of whatever lead them to this point, be it a tough morning, a tough year, or a tough life.
If that sounds like a goodie-goodie outlook, it's really not. Like hopeful4 said, it's mostly about making myself feel good... and not letting the turkeys drag me down.
