"I understand the concern. Though I do think you’re being very emotional right now. Let’s talk about this once you’ve had a chance to calm down."

I wouldn't recommend trying a passive-aggressive trick like that on someone unless you were comfortable with having them as an enemy for life. That is a declaration of war, especially said in front of other people.

A must read for anyone.

Even if you knew all the tricks already, the article will put words into each one. And as the saying goes: if you can't name it, you are not fully aware of it and you can't control it.