There is an exchange happening, even if that exchange is all show and no tell. What they were showing now was superficial, yes, but not when taken in context of what had already been shown.

The eye-roll turns his grin into something just a little smirky. "If you're going to turn it into a challenge...." She'd turned the gun into a challenge, too, but that was bait he wouldn't rise to. This? Sure. He could prove himself lazy and imaginative.

...he could not prove himself lazy, for anything, though he could try.

"You don't strike me as a woman who needs to be told what to wear. He stops walking backward to look over his shoulder only once he's close enough to spin and reach the door. "Something casual. Next time you want to wear black leather." Vinyl, whatever, "let me know and I'll show you just how imagination I have."

That sounds vaguely sexual. That's good, though frankly it may well mean the suit. Not much need to protect his identity here.