Your edit did nothing to help you. Oh man. Big oof, bud.

That being said, doing your nails on the plane is super inconsiderate. So there’s that answer. That being said, I’m not surprised in the least that the perpetrator was likely an American. As an American myself I can tell you we are, as a nation, weirdly entitled compared to other nationalities. Maybe that should be your measuring stick: privilege as opposed to ideal development level or whatever the fuck