This is not the psychic friends hotline.
When you walk into one of these newfangled coffee shops, you have to actually tell the person behind the counter what beverage you would like. You can’t just yell a size at them. “Medium” is not a drink.
Conversely, yelling “french vanilla cappuccino” in my face is hardly productive when it is availably in 4 different sizes and you do not deign to tell me which one of them you want.