Place it as the final beat of an argument exchange, after a protest and before the reaction settles. Open with the frantic No No Wait Wait plea, let this line close the debate, then follow with Nelson Ha Ha for the mocking payoff.
About this sound
This is a brief French voice line, lasting just under two seconds, in which a speaker delivers 'ouais mais pas toi qui décide' — yeah, but you're not the one who decides — in a flat, deadpan tone with no music or background effect. It feels sharply dismissive and playfully confrontational, the kind of confident cut-off that ends a debate with a single sentence.