Ha! No, I just stared at her in silence. It was deafening. After a couple of seconds, she realized how angry and bitter she sounded, then we parted ways. She was a trip.
Good tactic. Usually staring at people with the "you're an idiot" look is far better than trying to continue a fruitless debate.
I've seen desalinization plants in the Caribbean. They're most effective, and without them, the people who live on the islands wouldn't have water, potable and otherwise, in the dry season.