Okay let s settle this Look above at the section titled Peter and the 4th Grade The response to that question is and I quote No because it is just a joke Using throwaway comments or jokes as a source of information is specifically mentioned as something to avoid in Manual of Style writing about fiction The gag about creationists being stupider than retards is only a throwaway gag in the episode Petarded and is never even spoken orally only written on a cardboard sign Therefore it doesn t belong here If it were a recurring gag like that of Ernie the Giant Chicken then it would belong but it only makes a cameo appearance in one episode and therefore is not notable enough to be included anywhere but the cultural references section of the Petarded article