From Johns Hopkins magazine:

Professor P.M. Forni has collaborated with the Jacob France Institute at the University of Baltimore to survey people in the Baltimore area on the rude behavior they consider most offensive. Says Forni, who next spring will publish The Civility Solution: How to Prevent and Respond to Rudeness, "What struck me was that several of the transgressions had to do with behaviors proscribed by law. People chose big issues over pet peeves."

Below is "The Terrible Ten," the survey's list of the worst behavior, according to the respondents, ranked by degree of offensiveness.

1. Discrimination in the workplace
2. Dangerously erratic or aggressive driving
3. Taking credit for someone else's work
4. Treating service providers as inferiors
5. Making jokes or remarks that mock someone's race, gender, age, disability, sexual preference, or religion
6. Aggressive or bullying children
7. Littering
8. Misuse of handicapped privileges
9. Smoking in non-smoking areas or near non-smokers without permission
10. Using cell phones in mid-conversation or during a meeting