I've never met anyone who threw a fuss if you said "small, medium, large" instead of Starbucks lingo. They're all very sweet there.

The only people to watch out for at Starbucks are the angry old ladies, because they make your coffee bitter no matter what your order is - just like their souls. :x

You can ask for them to dump a bag of sugar into your coffee, and it still comes out horrible. I've taken to marking down multiple Starbucks in the area. If one of those old ladies is at one of my usual places, I'll go around until I find one with a younger person. They always make my coffee right, without fail.

On the contrary though, I went into Dunkin' Donuts once with a Starbucks cup because I wanted to buy my parents some coffee after I came back from college to treat them, and they got fussy with me asking how much of my money I threw away on my cup of coffee from Starbucks, etc. xD