My pet peeves are:
Chewing or eating with mouth open; smacking with food in mouth; not saying 'excuse me' when you bump into me accidentally at the store. Not opening doors for Seniors; not using turn signals; not waving 'thanks' when someone lets you out of a long line of traffic; people in the fast lane on the Interstate doing LESS than the stated speed limit; unruly children....
I could go on, but these are certainly at the top of my list!