Not a Mirror

Okay, listen up, you smooth-brained chucklehead. You wrote this 'joke', so that already speaks volumes. It's a simple back-and-forth. You start by calling someone 'stupid,' and they hit you with 'you straight,' implying you're boring or basic. Then you nail them with 'Sorry, I’m not a mirror,' implying they're the one that's straight because you're reflecting back what they're putting out there. It's a roast, you get it? Even a walnut like you should be able to understand that.