Well, duh, you idiot! :-).
Perhaps that is the influence of Ayn Rand, or maybe it comes from the conviction that libertarians see the pure light of rationality but are doomed to be ruled by their purblind inferiors.
I really wish I could argue with this (because I tend to be argumentative), but that hit dead on.
Liberaltarians are simply Leftists in all respects other than taxation and business regulation. Socially, they are Leftist radicals.