From WiseBrother.com:
A nationwide study looked into which cities have the rudest drivers, based on the ratio of drivers with certain "rude" violations on their record . . . like failure to yield, passing where prohibited, tailgating, street racing, and hit-and-run.
Basically, inconsiderate drivers who endanger the lives of others.
In Colorado, Broomfield has the 'rudest' drivers. There are 42.60 drivers cited for rude behavior out of every 1,000.
Check out the full list HERE.