Reply #49: I would only mildly suggest

[Arianrhod]

that you not respond to them in kind. Let them rant and rave; for your part, be calm, dispassionate, and stick to the facts. Getting into a screaming match will only set up their defenses and prevent them from hearing you. OTOH, remaining rational will demonstrate that you have the truth on your side--something that will stop their argument in mid-sentence.

It's actually kind of fun to watch people flounder when they cannot refute your statements. :)