Democrats have a real problem with saying true but demeaning things that you have to discuss when coming up with strategy, out loud in public.
Hillary’s “deplorables” thing was maybe the most prominent example. Her point was that democrats who think that all republicans are committed to evil positions we can’t compromise with or entertain isn’t correct! Only about a third of them are, according to the data. The rest could maybe be reached or worked-with!
This is true shit you say in blunt terms in a strategy meeting or nerdy discussion groups, not in public, because poli sci is just full of demeaning stuff about voters, because they are stupid and often evil and if you study democracy soberly that’s what you’ll find, and you have to grapple with it to act effectively, but you don’t say it in public because most voters also don’t know that stuff because they’re not poli sci nerds. She, and/or her speech writers, had been around strategists and wonks too much.
[edit] on the other hand, one wonders how much this really matters when Trump wins while saying worse things about all kinds of folks. The way the media approach and characterize and amplify (or don’t) the messages may matter more than what’s actually said.