The point wasn't the rare coal town but the perception that pervades the rural areas of this country. It doesn't have to be coal towns - there are similar stories for all smallish cities across the Rust Belt for example. You're focusing on a specific when really the point is that fascism grows only in poor economic situations.
These people are legitimately suffering and they are turning to hate as a response. Trust me, you or me could have easily been in their shoes had we been in their position. But just like they have been swayed to hate, I think it's possible to sway them to socialism as long as you call it something other than socialism.
Zizek has talked about this before where Trump supporters in 2016 were a hair's breadth away from being Bernie supporters. While a bit of a dramatic statement, there is some truth in this. When the economic situation is unstable, radicalism grows in both directions - left and right. Which is why around the same time period we saw an openly socialist candidate for president in the US receive about 6% of the general vote - while we also saw massive Nazi rallies in New York City.
Everything is connected. We are fighting for the hearts and minds of the same people.