In America, when I ask for half a cup of coffee at Starbucks (no I don't ask for a discount), because I don't want/need that much coffee, I get weird looks. Or

In America, when I ask for half a cup of coffee at Starbucks (no I don't ask for a discount), because I don't want/need that much coffee, I get weird looks. Or when I am at Taco Bell and I just want a small cup of soda, instead of that giant cup they give, I always get the "are you sure?"