I've never been into a fight (well I have been in a fight, but almost never), because I've had people back me up. My comments are usually only for the fastwitted as well. I've noticed that it can take a person quite some time to really understand what I say. Which is why I'm always surprised when all of a sudden someone gets angry at me days after our conversation.
I don't do it online, because English isn't my first language, but when I speak Dutch people can almost always interpret my words in several ways. It is an annoying habit sometimes.