What probably happened is said pax pointed out that her kids spilled popcorn and the FA said it would get cleaned up when they land. That probably wasn’t good enough for her though. There’s nothing that the FA’s can use to clean up popcorn other than getting on their hands and knees and cleaning it up. Just speculation though. The pax strike me as the type who lets their kids trash the airplane when they fly private.
Idk which is worse, this story or the one where the guy got pissed because the Air Canada FA working his cabin couldn’t speak Canadian French to him and he became upset even though he spoke English.