I mean, he CAN be suave and charming? I think he can? Just because we've never really seen it doesn't mean he doesn't know how to be. It's just not really his style.
Maaaaybe he didn't. I think there was a small bit of it when Elijah took his shirt off, just a little bit of eye flirtation, maybe. Nothing overt. They certainly are flirts now though.
"Hey, how're you doin'?" to every pretty girl.