My father opened a door for two girls in their late teens or early twenties. One of them snapped at him, we re not handicapped you know, we can do that ourselves . Dad replied, I m dreadfully sorry, I was clearly mistaken in that I assumed you were both Ladies .

One of them stormed ahead, while her mate collapsed in giggles.
What is your story? What is the most polite rudeness you've ever witnessed?