Dear Coffee Consumer,
When you walk into Starbucks and so politely ask for "a large coffee", please don't take to social media to complain that the barista clarified that you meant "Venti".
Starbucks drinks (for the most part) come in three sizes: Tall, Grande and Venti. This obviously does not fit the same scale as "Small and large".
Having worked in a Starbucks franchise I can confirm that most of the time when the customer asks for a "Large coffee" they mean Grande. On top of that, some customers who ask for a small often actually want Grande. Don't even get me started on "Regular".
So shut up and drink your coffee.