Why are people so RUDE!?

It seems like most people are rude! I dont understand why. Most people i know are rude to me or hurt my feelings, and people i dont even know are rude :( Like on yahoo answeres, most people who answere my questions are rude -_- even when im driving sometimes people will flip me off! Why are people so mean to each other? Does it make them feel better then someone when they are rude to someone? Sometimes i just wanna be rude to everyone since lots of people are rude to me. But i dont wanna be mean like them and hurt peoples feelings :\ Since i know how it feels...