Place it right after the nosy question in your edit, then follow it with Nelson's Ha-Ha! to close the exchange. If the exchange needs more disbelief first, open with No No Wait Wait before the dismissal lands.
Über diesen Sound
This clip is a short French voice line saying “Ça te regarde pas,” meaning “it’s none of your business,” delivered in a flat, dismissive tone. It feels blunt and funny, with a cool edge that turns a nosy question back on the asker without raising your voice or starting a real argument.