Obviously they were both suffering their own effects of their anger.
For just a second, he was going to correct her about the direction of the bedroom, but if she followed him to bed, they would be likely to just grumble and bitch and moan more, and neither would sleep.
Perhaps in the morning, she'd wake and see sense, and then she'd apologise for being stupid.
And perhaps hell might freeze over too. "Fine, go get some sleep," he muttered in little more than a grumble. He was beyond caring now, and it wouldn't matter that he'd sleep alone.