If you dig a tiny bit into mixology, you'll notice the ludicrous amounts of sugar that goes into cocktails.
An espresso martini has 80% of your daily sugar intake. That's 25g of sugar. Moscow mule 75%, Sangria 70%. All of those in one single serving.
I'd wager most people don't stop at one drink.
Daiquiri has sugar. Espresso martini has sugar syrup. A gimlet has simple syrup. Irish coffee has sugar. Long Island Ice Tea has more sugar syrup than any single liquor. Mai Tai has simple syrup. Mojito has cane sugar.