Justified, or Just-a-Jerk?

Setting:  Taco Bell drive-through.

Me:  “I’ll have a #1 with a normal taco and a Diet –”

TB:  “Okay, I have a #1 with a soft taco and a Diet Pepsi.  Anything else?”

Me (annoyed):  “No.  Listen, please.”

TB (pause):  “I’m sorry.  Go ahead.”

Me:  “A #1, with a normal taco instead of a Taco Supreme, and a Diet Pepsi.”

The drive-through operator apologized again.  I pulled to the window, where I apologized for snapping.

I’ve worked fast food.  I know it can be tough.  But is it too much for me to expect them to listen to my order?