kids and coffee??

Rachel
So I've seen so many pics, videos, and even experienced it with my own eyes all these parents letting their kids finish their Starbucks drinks. (Caramel macchiatos) The kids are like 1, 2, or 3 years old! 
I even have a friend who fed her 6 month old a lemon loaf from Starbucks.   
Maybe as a parent you just see those big adorable eyes and can't resist! 
I don't have children (but hopefully will soon) but isn't this a big no no?? Or is this completely normal?