My sympathies OP, it can be annoying. I was once waiting in Pizza Hut and the lady said, "How many pizzas do you want? 'Cos we're shutting soon."
I replied, "Well I only wanted one, but since you're shutting soon, PLEASE DON'T BOTHER!"
She said, "Oh we're happy to make you one pizza, I only asked because -"
I replied, "NO! You're shutting soon so go ahead, shut, shut, SHUT!"
She continued trying to serve me, saying, "We can do you a pizza, there's no need to -"
I screamed, "NO, SHUT, GO AHEAD, SHUT, SHUT, SHUT, SHUT!!"
But there's no reasoning with those people.