Place it right after the statement you are rejecting, as the final word in that beat. Follow it with awkward crickets when the disagreement needs to hang in the air, or cut straight to the next speaker if you want the conversation to move on quickly.
關於此聲音
A very short voice clip, under one second, of a speaker saying 'discordo', the Portuguese word for 'I disagree'. It lands as a blunt, deadpan objection, funny because the rejection is instant and absolute, with no explanation or softening added afterwards.