Rose
Getting Damon to talk isn't exactly the easiest thing in the world, but it is possible. Even if he's snippy about it, eventually, he'll do it, more times than not. Elena showing up here would be problematic for a lot of us, I think. If you ask me, she was never the selfless angel people made her out to be... but from what I can gather, becoming a vampire didn't exactly do her any favors.
Just let him have his time to cool off and try to confront him about it later. Don't be crazy or rage at him or anything, just a calm, why is this bugging you, conversation.