There are SO many angry people in the world. They are angry at their OWN issues; which doesn't/didn't help you I know.

I would have said....Mrs.....as long as you CHOOSE to speak disrespectfully to me, I will not assist you. She probably would have yelled some more, and then I would have said; I will have to say goodbye, if you choose to verbally berate me. Your anger has nothing to do with me. No one could have (boss wise) taken offense at that. We ALL have a right to be treated with respect.