No Mixing Here
To make a Starbucks Pink Drink, the barista will throw all of the ingredients inside of a mixing cup. After everything is in there, they’ll cover it with a lid and give it a few good shakes. After that, they’ll pour it into your cup and send you on your merry way. Well, that’s how it’s supposed to be.
If your barista is feeling particularly lazy that day, what they might do is build your drink directly in the cup. No mixing takes place, and they’ll leave that up to the customer. Sure, it’ll be hard to mix in a flexible plastic cup, but hey, that’s your problem.