I tend to be pretty non-confrontation in the "real world." The only time I will outright be rude to someone is if they are really pushing me over the edge and if there is no other way.
For example, over Christmas break this year my mom was laid up with a broken ankle. I spent most of my days at home with her while my dad was at work. One day while her sister was over, a car drove up the driveway. I went out to greet them, and some ladies wearing long, colonial style-dresses and bonnets walked up. The one in front had some books in her hands. Lo and behold, the Jehovah's Witnesses were upon us.
I greeted them, and they asked me if I knew about the good message of Jesus. I said yes, we are Methodist. So the lady patters on about how even in these tough times Jesus is looking out for us, and kept trying to push some scripture on me. I knew if I let them continue, and especially if they saw my mom's cast, I would never get rid of them. But I just couldn't bring myself to tell this kind lady to get lost. I was thinking it, but I couldn't bring it to words. Plus, I'd never had experience with salespeople or anyone in that sort of situation.
So then my aunt came out. She is a southern Baptist, and can swiftly handle things like salespeople and Jehovah's Witnesses. She was firm--she wouldn't let the lady get another word in and just kept telling her "No, we're not interested, we have our own faith, we've heard it before. All you can do to help us is leave." Se had them heading back to their car in less than a minute.
So I think next time I'll not be answering the door until I know who's getting out of that car.