The Forehead L is like eschewing the more colorful swears and instead calling someone the naughtiest word you could say at South Kearns (Utah) Elementary in 1982 - Butthole.
i think you're right really but something about a young woman not even bothering to get mad and just doing the equivalent of "you can't sit with us" feels like it might make them cry
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This brings the thumb to the forehead with the L sign.
Raises the stakes :)