Place it right after the question or lecture in your edit, then follow it with the Oh No No No Laugh for the reaction and the Shocked Meme Sound when the other person realises they are being ignored.
關於此聲音
This is a short sung lalalalalalala, a light human voice humming the familiar syllables over about two seconds with no words or backing. It feels playful and deliberately oblivious, like cheerfully refusing to listen, which makes it land as a tease rather than a real song.