Am I in the wrong???

So, today I was getting a smoothie. They call my name, the man who was before me thought they were calling him. He went up, grabbed his straw, sipped my smoothie before realized it wasn’t his, then gave it back.

I noticed, and I told the cashier that I don’t want a smoothie that someone sipped. He said I’d have to purchase a new one, bc I should’ve came up when my name was called. 😳 btw, the same person who took our order is the same person who gave us our drinks.. 🤷🏻‍♀️

I got upset, and walked out of there without the smoothie I paid for. 😶 am I wrong for wanting a new smoothie?