Considering that the coffee shop seems to be a haven for the liberal arts major (and literally anyone else who wants to make a living by writing, eroding their souls a bit more with every keystroke), it's no surprise that the writerly class tends to gravitate toward the place where they've spent so much of their time and money, searching for a new gig (likely to recoup their earnings).
But when you're making just above minimum wage, hoping against hope that you'll be able pay off your debts and earn enough cash to eat something more than spaghetti and peanut butter, it's not surprising that you might take..."liberties" with your customers.
Enter the Starbucks Barista (portrayed, this time, by comedian Paul Gale):
So remember, they're just trying to psych you out. Take the power back: mispronounce your own name in such a way that they've got no choice to but guess.
Works for Sean ("Seen") McLaughlin up in Phoenix.
(Remember, baristas in Tucson's own coffee houses don't pull this power play with you. Keep your coffee consumption local; it'll make everyone happier.)