Meh. I used to be all uptight about stuff like this. Now, I aspire to be a live-and-let-live descriptionist, wafting around in a carefree manner whilst singing "Anything Goes!".
However...
I worked on and off as a barista for 2 months last year.
The first time someone asked for an "Expresso", it didn't bother me in the slightest. Nor the second time. Nor even the third.
By the hundredth time, on the other hand... Well, let's just say that this mug makes my feelings clear.