The sarcasm. She hadn't exactly caught it, but she went over what he said and the tone again in her mind when he added the notation. Yes, it fell into the parameters of sarcasm. Apparently, it was important to him.
She watched him go into the bathroom and found a place to set her clothes out of the way. She then looked at the closet where he kept his computer. No reason to trust her, but she didn't want to give him a real reason not to. There was also the question of where she was going to rest, considering there was only one bed. She sat herself down in a chair and waited.