Specifically from season 12, episode 8, "The China Problem" from 2008.
It's making fun of the idea of media makers "raping our childhoods" in particular Spielberg and Lucas violating Indiana Jones by releasing Indiana Jones and the Crystal Skull earlier that year.
Everyone keeps blaming the aliens but I didn’t that they were that bad a fit. But the movie was terrible and at that but where LeBouf started swinging through the trees I was ready to walk out.
Personally i can't get onboard with aliens when the rest of the series is cemented in the religious supernatural. The two genres are mutually exclusive in my head.
That said I do get that aliens are the pop culture thing in the timeframe where that film was set so the decision makes sense. Execution was just piss poor.
So this is where chuds got tgeir idea for culture war...
That shit's been going on for way longer than South Park has existed.
Its also got one of the series' best jokes with "free hat"
He killed those babies in self defense!