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Um... I don't think the reader found this bumbersticker stupid - she just didn't get the joke, see? It says, "if men were meant to have a foreskin, they'd be born with them", right? Well, the thought that come to most people mind is "but men ARE born with foreskins". People who "get it" then say "Ooooh. Good one." People who don't get it go "Wow, someone is so stupid that they don't KNOW that men are born with foreskins."
The reader may not have been particularly good at understanding irreverent humor, but I don't think it was meant to undermine "intactivist" ideas. She just didn't "get it".