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The following is an excerpt from the script of The Spirit of Christmas: Jesus vs Santa, made in 1995.

Cartman: Heh heh, yeah, Hanukkah sucks!

Kyle: Don't you oppress me, fatboy!

Cartman: Don't call me fat, buttfucker!

Kyle: Then don't belittle my people you fucking fatass!

Cartman: Goddamnit don't call me fat you buttfucking son of a bitch!

So no, Cartman didn't start hating Jews in the beginning of the show, he hated jews before the show even began.

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