They claim to believe in maximum freedom regardless of the societal consequences.

A classic example is imagining the only water source for a hundred miles in any direction being claimed or purchased by someone. A libertarian would tell you that they should be entitled to sell that water for any price they like regardless of how many people will die as a direct consequence, and they insist one of the state's only functions is to shoot the people that try to take the water rather than just die quietly.

If you corner one in a debate, they'll eventually admit that the personal freedom without accompanying social responsibility is the only thing that matters, and that society probably won't be able to function as a result, but it is worth the collapse to maximize the freedom of the individual... to be a sociopathic dick.

They're kind of modern Republicans minus the "because supply side Jesus told me so" Schtick that absolves them of moral responsibility for their antisocial opinions and positions. Libertarians don't tend to care about the veneer of finding a reason to blame the people who got hurt by their bulldozers, "I have a bulldozer so I win lol." The state, in their warped mind, should only exist to protect citizens PROPERTY RIGHTS from others, full stop. No social supports, literally no public anything. They even fantasize about privatizing all roads/schools for private profit.

Most billionaires conduct themselves as libertarians. Cut taxes to the bone, with the sole exception being the defense/police/court system infrastructure that protects their Ill gotten dragon hoards from those they exploited it from.