Anyone who cites Cindy Lou Who warrants attention and a respectful response. I suspect that there are more "pickup trucks" per capita in Gander, Newfoundland than anywhere else in the world. On 9/11 this little town of less than 10,000 souls welcomed 38 US airliners alighting like butterflies on a tree, and some 7000 passengers and crew within hours and cared for them until it was clear to fly again.  I doubt that there was a nationality, colour, creed, or culture that wasn't represented.  
Truly, the "deplorable" characterization was a) stupid, b) maximized for effect.
When I heard the phrase I associated it immediately with the rather obvious release of rabid fringe that was deliberately incited. 
One thing the exit polls did not ask was how many of the urban, young educated majority who voted for Ms Clinton were the sons and daughters of those rural and ex-urban parents who lost their jobs and/or stayed in declining communities and voted for a change that likely will not happen.