He stares blankly for a moment, then pauses to try and discreetly glance around the store a little. It seems like an ordinary store... why would it be unpopular? A lot of the stuff on the racks looks pretty cool to him...

Actually, why would he care if it's unpopular? After failing to notice anything odd, he goes back to scowling at Sonic. Is he trying to hog this store for himself or something?

"And what would those subcultures be? You were here first, so obviously you must be familiar." That's at least half a genuine question, even if his tone doesn't suggest it. He really has no idea.