The exact origin of this clip is undocumented: the source block gives no recording, episode or upload it comes from, so it is best treated as an anonymous soundboard upload. Short rejection clips like this one circulate widely because they are endlessly reusable, and the name 'Aizawa' gives it a clear target, a specific person being told no. Creators keep reaching for it for the same reason they keep any one-word shutdown sound around: it delivers a verdict in about a second, with no setup and no explanation needed.