Libertarianism not only allows for public naming and shaming of immoral acts, but pretty much requires it to prevent libertine behaviors that may be harmful. IMO the only way Ancapistan works is if there are strong social structures like the church, family, or neighborhood that enforce good behavior through public expectations and freedom of association.

People can certainly smoke weed or do whatever they want, but without any social support making up for their recklessness, they will soon end up on the outskirts of civilization. If casual recreational use doesn't cause a problem then they'll be fine.