That sucks!!! I'd be really upset, too.

I agree with Kilted. I would probably just let him know via text that he left his phone on and I heard what he said and then let him sit on it all day feeling stupid.

If you go on offense he will automatically go on defense.

Let him come home with his tail between his legs rather than giving him a reason to turn it around and be mad at you by calling him an a-hole.