It's amusing to watch Q push his hair out of his face, and then have it go straight back to where it started. A vicious circle of futile efforts that must not really have been as much of a bother as he pretended it was, or else certainly he'd just cut it. John decides, with another drink of his beer (it's a bit too hoppy, he'd made the wrong choice, but doesn't stop drinking anyway), that possibly Q isn't as innocent as he makes himself out to be. He's clearly an intelligent bloke, after all. It's interesting.
"Course you are," he says, and it comes out cheekily. John has never lacked confidence, after all.
But John is a lot of things, and a creep really isn't one of them. If he was looking for just an easy hook up, and not a friend, he probably wouldn't have gotten lost on a foreign bus system just to get here. So he backs it up a little, just to keep things fun. "So what makes this place any better than the rest of the lot?" The bar, in question.