Welcome to the first Doggerel of 2007, where I ramble on about words and phrases that are misused, abused, or just plain meaningless.
Often, woo trolls like to think that when we get riled up, it's because they're threatening our worldview or something. Usually, nothing could be further from the truth, since there are plenty of other reasons to get seriously annoyed with them:
First, we are not required to suffer fools lightly. If someone repeatedly spews out logical fallacies while demonstrating zero effort to actually comprehend a skeptic's stance on an issue, it's only natural to get angry. In this instance, it's kind of hard for them to be threatening to your stance if they don't bother learning what it is. You can't really threaten an idea if you don't know anything about it.
Second, a lot of the people who use this are shameless trolls, and often employ other troll techniques that get under our skin without contributing anything to the discussion: Copy-paste floods, "UR GAY"-type insults, all-caps, red herrings, etcetera. Sometimes rudeness is necessary to get a point across, but all of the above are unnecessary.
Third, if they want to threaten our worldview, it should be fairly easy: If we're defending a scientific theory, there are ways to falsify them. We know what it'd take to prove us wrong. If we don't accept their claim, they should probably see about applying for the Randi Challenge or conducting a similar experiment.
Of course, as I feel oddly compelled to point out all the time, this is another example of a subject change. Even if we do feel threatened, that doesn't change the soundness of our arguments.