Seinfield was _never_ sophisticated.
The stupidity was part of the fun of the show...
Even if they were, the Seinfeld crew surely believed that America west of the Hudson is inhabited by inbred gun toting hicks who voted for Reagan.
You know, I DID attempt to watch a Seinfeld episode. After ten minutes I switched off because the characters were clueless, neurotic, and ineffectual, so maybe you’re right.
;^)