I think maybe I don't because I don't want to seem like a jerk who is holding up the line. But maybe I wouldn't feel like a jerk if I knew what the proper thing to do when you get a bad drink is. I contacted several coffee shops and asked for the proper thing to do. It is our goal to ensure that every customer receives great service and a quality beverage every time they visit a Starbucks location. And to not feel bad about it.
Coffee is only good when it is done right.
So the next time you get a bad one, hand it back. And don't feel bad about it.