I think it is because many of folks in the US don't quite get it and take it literally.
Also maybe I am right or wrong but I think the anti-defamation league might not be too keen.
either that or you guys have realised he is sending up the midwest Americans, reinfrocing a negative stereotype and thus people don't like it.
If you take it satirically and read behind the face value joke there is a lot going on.
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