He is very drunk. He's just aware of himself to recognize that much. He is more distantly aware he's probably going to say things he shouldn't. But, he couldn't be more serious when he speaks to her then.

"You could never make a fool," He says, holding her gaze as much as she'll let him. "You sing wonderfully, with all your heart all the time. No time could change that." He smiles back, encouraging, and also a little lopsided. "Besides. I've been here all evening. These people know a fool when they see one."