[...] to me it isn't even clear that Crowley was a Satanist. I think he may have just been an occultist, though he did summon some pretty powerful demons and spirits in his secluded home in Scotland. [...]
Well, he did refer to himself as the Beast, as per the Biblical Apocalypse. So I think it's safe to say that he was most definitely a satanist.
What's really going on, of course, is that she's not 'winning' the argument. She doesn't want to discuss. She wants to be right and win. And she can't deal with not having the upper hand.
Sure that happens at times, but by no means every time. Other times a person can simply see the proverbial handwriting on the wall that continuing said conversation is a dead end, say so, and promptly move on without needlessly wasting more of one's time.