I think you're either confusing Singapore or libertarians with something else. Singapore is a surveillance and censorship happy city state that China aspires to become.
Are you sure you meant libertarians? I don't see how anything about Singapore would fit in with libertarian ideology...
"Libertarian" has just become lingo for "people with political ideologies that I consider fringe". You can find people calling anarchist ideologies "libertarian" while also finding people willing to call those who dream of Singapore libertarians. There is not rhyme nor reason to it.
Low tax rates, low burden of regulation, market-oriented systems for traditionally government-provided services (tolls for driving, making individuals bear a proportionate amount of the cost of health care), more individual control over government old-age savings system.
Sounds more neoliberal than libertarian.
They banned chewing gum for the longest time. Singapore definitely isn't socially libertarian.
Most chewing gum is still banned [1]. This, however, is almost never enforced in practice.
On the flip side, public drinking and prostitution are legal in Singapore.
I know it's anecdotal like your own post but I saw an Anthony Bourdain Singapore episode and he said it was one of the worst possible places for libertarians like himself. I know I hate it.