She should not have gotten physical with him, but he was a danger to himself and her with the nonsense he was about to do.
Really really dumb on that guy's part. Even if you're the party type, you never know what who'd had a past with drunk drivers so it's definitely not a first date thing to do (I know people like this, even they'd tell you they wouldn't attempt that on a first date).
Personally I don't drink from the jump, so it doesn't even apply to me. But I wouldn't be caught dead with a drunk driver IDGAF if I end up stranded, screw off.