"often aren't mentioned"? Nothing could be further from the truth.
Literally 100% of the time that anywhere in the US outside of the major tech cities gets brought up, the comments are full of people claiming that the inhabitants of those areas are racist, stupid, dangerous, unwelcoming, or otherwise bad and undesirable to be near.
The double-standards on this website are mind boggling, for how casually and openly people will believe negative stereotypes and repeat discriminatory beliefs when the 'out group' is rural, southern, or even just non-coastal.