Its a holdover from the time before liquor started being sold in metric quantities. It’s not consistent at all, a pint is 375ml, a half pint is 200ml. A 5th, for fifth of a gallon, is 750ml. The names are used because they visually resemble the old containers. They are slowly falling out of use, but replacement terms haven’t really stuck and just stating the ml doesn’t have the same charm.
Worth noting this just applies to booze. A pint of milk here means a US pint of milk (~473ml). Same goes for beer
Holy fuck, please shut up Hillary, you are not helping. You are an electoral poison. You are to polling numbers and engagement as Rob Schneider is to Rotten Tomatoes scores. Please, if you want to help, just go gentle into that good night.