Place it as the punchline after the baffling claim, not before it, with Oh My God Wow opening the exchange first. Follow it with No No Wait Wait when the speaker tries to backtrack, then let Nelson's Ha-Ha! close the joke if the moment turns into full mockery.
About this sound
A 5.6-second clip of Jimi stammering 'wh-wh-what are you stupid!?' in disbelief, his voice tripping over the first word before landing the insult with sharp, mocking emphasis. It feels instantly funny and confrontational, the kind of incredulous reaction that turns a dumb comment into a joke. The line comes from Jimi on Podtaku.