Dude, I lived in Chicago, LA, and NYC for a brief time. Drove in Germany for 3 years too. Here's my observation:
Drivers in the Windy City are by far the rudest, meanest cagers I have encountered!
I don't care if they are driving SUVS or Ford Pintos, they are brutal and you know what I'm talking about if you haved lived there for any amount of time.