Place it right after the insult or tease in your edit, then follow it with the sad violin before cutting to the next scene. For a bigger reaction, open with oh my god wow, then let this clip answer it.
關於此聲音
This is a short spoken line asking why someone has to be so mean, delivered in a wounded, pleading tone that lands somewhere between a genuine complaint and a joke. It runs for under four seconds, just long enough for the question to sink in. The delivery gives it a hurt, slightly dramatic feeling, perfect for calling out a tease without sounding truly angry.