NASHVILLE — I was a graduate student in Philadelphia when James Watt, the former Secretary of the Interior of the United States, came to campus in 1984. Mr. Watt’s brief tenure in federal office was characterized by an almost cartoonish villainy. Rolling Stone magazine called his attitude toward the environment a “rip-and-ruin view of our natural resources, land, water, parks and wilderness.” That night Watt argued for letting each state set its own air- and water-safety standards, a position that makes no sense if you’re aware that rivers and winds don’t respect state borders.

During the Q. and A., I took my turn at the microphone to make this point. “Sir,” I said, “I’m from Alabama.” Instantly that giant audience of Pennsylvanians broke into laughter. Who was this cracker daring to voice an opinion about federal environmental policy?

Well, that was 1984, you’re probably thinking. Today we don’t judge people by their accents any more than we judge them by their skin color. People know better now.

Except they don’t. The political polarization of our own day means that a region like the South, a red voting bloc in national elections, is a source of continual liberal ridicule, no matter the subject. In June I wrote about the transcendently beautiful Mobile-Tensaw Delta, one of the most ecologically diverse places in the country. When I posted the link on Facebook with a note about its magic, someone commented, “Except that it’s in Alabama.” As though nothing in the whole state could possibly have any value at all.