Once upon a time, I applied for a job in a cafe, and the interview included answering several written questions about coffee, coffee based beverages, ingredients, etc. Anyone who spelled espresso wrong in their written answers (as in expresso) was disqualified and not considered for the job.
"Express shot of coffee" isn't very specific to me. That's like ordering "cookies" instead of "biscotti" or "small sandwiches" instead of "panini."
Yes it is what it is, but just because a lot of people spell it wrong doesn't make it right... The term itself refers specifically to the Italian name for the drink. To me, saying expresso is like when people add "o" at the end of an English word when they don't know how to say it in Spanish. Anyway, I was just informing the OP, I was not making fun of him.