Raging out at office is really common with me too. I dont know why but i tend to meet a lot of people who are doing what they do not know about or what they shouldn't really do because they do not care about it. This rages me out because I have to explain the same thing over and over again to similar people who do not understand the basics of their job and duties.
But yes, professionalism is important. Being polite is a better way to tackle any situation.
Many times repeating over and over again is often very annoying, I get the point. The truth is that you have to have a lot of patience.