Home Plate on Lombard Street in San Francisco has a similar policy, reported SFGate. Signs posted around the restaurant and on the menu asked diners to "Please Drink Responsibly. $50 cleaning fee per person for any incident incur as a result of intoxication."
Other brunch restaurants in the Bay Area use "mimosa fairies," servers devoted to monitoring the intake of guests.
Which type of liberalism is this? 
Fair enough, but "shitty" rum and coke is miles better than whatever grain liquor they use with the whole lot of sugar in it.
I guess it's not for me, but I totally understand bringing some smirnoff ice or white claw to a party/picnic.