Place it as the closing reaction after the fail itself, not under the setup. For a bigger sequence, put a vine boom sound effect before it for impact, then follow with the spongebob fail sound effect if the embarrassment needs a longer deflating tail in the edit.
About this sound
A 1.8-second spoken clip in Brazilian Portuguese, Rodrigo Faro delivers the line “que papelão, hein” in a mocking, disappointed tone aimed at someone who has embarrassed themselves. It creates instant secondhand cringe and playful scolding, like a public call-out for a foolish display. It is widely shared online as a Brazilian reaction clip tied to his TV hosting work.