Take on Starbucks sizing

It's not the outrageous pricing or the dirty bathrooms that annoys me about Starbucks, it's the attitude   I realize that I am probably of average intelligence but one thing I still have yet to figure out are the sizes of the coffee at Starbucks.  I walk into the store a few times per week and struggle with my order which is supposed to be a medium vanilla no water chai and a large pike place roast but am always made to feel like an idiot and corrected l by the server with their foreign coffee language.  How in god's name am I supposed to keep Venti's and Grande's and tall's straight in my mind when they themselves make no sense at all

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