Place it right after the bad idea is stated, then follow with Bruh Meme for a second beat before the Fail Sound Meme closes the moment, keeping the refusal as the turn in the edit.
Über diesen Sound
This is a short voice clip centred on the phrase well no, lasting about 4.3 seconds, and it delivers a plain refusal in just two words, giving the listener a brief, awkward sense of disagreement that feels reluctant rather than angry, as if the speaker wants to say no without starting an argument.