Alex apparently didn't need alcohol to feel intoxicated either and maybe later he'd realize it was some vampire thing that was doing it, at least part of it. If Damon was playing dirty here, Alex didn't quite care in that moment. He'd also be grateful Damon didn't do it while Alex was with Leon...
"Fuck off, Damon," he half purred, the conviction there, but the meaning playful. His fingers tightened as he pulled the sides of the jacket. People were looking and he was at least present enough to realize that. "Let's just go somewhere before I knock one of your customers out, then have to treat them at my hospital."