Grr I hate it when people act like that!! I don't have a story to share, but I know I have had people been rude to me before. I'm always perky and nice to everyone, but some people are just...ugh! If someone's nasty to me, that becomes all I can think about.
I was always taught to use my manners, hold the door for people, help the senior citizens across the street, etc. Some people just don't realize when you're doing something good for them.