No it’s not, it is etiquette. Specifically, the etiquette of bringing your own syrup to a restaurant that already provides syrup.
I drink their coffee, but I bring my own sweetener as I prefer it. I do not care at all if that offends your gentle Oklahoman sensibilities.
Michele, you misunderstood me. See below.
Fruits and vegetables are very fresh and cheap in Colombia, which is nice. If you make your own food, as I did, it can be excellent. The Colombians are generally not very good cooks, though.