I don't know why it still surprises me to be met with disdain just about every time I call myself a libertarian. If it weren't for our insistence on sticking with two parties, it might not carry such a stigma, since it's largely comprised of principles almost everyone would like applied to themselves.
Of course, the Republicans think of Libertarians as lost votes, and Democrats see libertarianism as conservatism. Conservatives dislike ideas like drug legalization, and liberals dislike free capitalism.
Oddly, though, I've heard people claim such bizarre things as libertarianism being anti-freedom, which confuses me. Often, people don't understand libertarianism. Here's a very simplistic rundown:
People should be free to do as they wish, so long as they do not hurt others.
People should be allowed to amass as much wealth as they'd like, and they should be allowed to trade it freely.
If someone uses force or threat of force to take from others (be it life, liberty, or property that is being taken), responding with force is justifiable. Otherwise, it is not.
Yeah, I know it's far from thorough, but I'm often made fun of for my somewhat verbose explanations, so I'm going to leave it at that for now. Besides, most of my possible readers are probably familiar with libertarianism.