"We reserve the right to refuse service to anyone, at any time, for any reason."
While in Montana I had a similar experience with a woman who wanted our shop to print up a bunch of posters she wanted made of her art, which were inappropriate. She threatened me in this way and I simply pointed to the sign, prominantly displayed in the store and said that the sign applied to her as of that minute.
Never heard more about it. This was maybe 13-14 years ago.
You beat me by 5 seconds!
Carolyn