You're mid-sentence explaining why you can't eat dairy, and they stare at you like you've just described quantum physics in Mandarin. So you repeat it. Slower. Louder. By the third time, you're pantomiming lactose intolerance like a mime trapped in a refrigerator, and they finally nod and say, "Oh, so you don't like milk?" Yes. That's the thing I said the first time. In English.