Place it immediately after the silly claim in your edit, then follow with Oh My God Wow for the next beat before Nelson's Ha-Ha! closes the mockery with a laugh.
About this sound
This is a one-and-a-half-second Peter Griffin voice clip delivering the line 'You stupid N word' in his flat, cartoon drawl. It lands as a sarcastic, dismissive put-down, the kind of blunt insult that makes a foolish comment feel even smaller. The voice belongs to Family Guy's bumbling dad, so the joke carries his familiar foolish confidence.