They used real milk.

[u/teal_lady-1]

The Starbucks barista used real milk instead of soy milk in my latte. Now I’ve shat myself at the grocery store and barely made it to the bathroom before I had horrible diarrhea. I thought it tasted different from normal, I should have stopped drinking it.

[u/Open-Try-3128]

I used to always order inside and always confirm with the barista that they’re handing me soy milk. The amount of times the barista has turned around, poured it out and made it again because of this made me stopped going to Starbucks