The Left’s support is concentrated in urban areas.
“White Rural Rage”, both the book and concept, is an operation to isolate, demonize, and destroy those who resist totalitarianism. Democrats rely on division and projection as favored tactics.
Compare crime rates for America’s rural areas versus big cities to quickly see who is enraged and dangerous.
The primary difference between city and country people is the degree of independence and self-reliance; these are two completely different worldviews that have little in common. The former are much more accustomed to having someone else do many things for them than the latter - including thinking for themselves. City folk want a nanny-state government to make decisions for them and to insulate them from consequences of their actions, while country folk have no choice (logistically) except to do these things for themselves.
These are unreconcilable difference, and the glaring difference between the Control-left and freedom/independence loving Americans of “flyover country”.