I'm of the mind that stating your case in an assertive manner is the best way to go. When you confront someone with anger, it only puts them in a defensive mode and they don't really hear what you are saying.
I also believe that venting anger is goodfor you...like punching a pillow or whatever other inanimate object there is.
I think its always a good thing to be in control of yourself when responding to someone else's bad behavior.