I think that's a major part. Trump's victories came at the hands of democrat failures - and by trying to blame everyone but themselves, they refuse to learn from their mistakes.
Essentially, the democrats argument is 'NO, YOU'RE WRONG', apparently:
1) 50% of the voter base is wrong
2) The election (that they've used for many decades without complaint) is wrong
3) The voter ID laws are wrong
4) The Russians are wrong
5) WikiLeaks are wrong
6) Your news sources are wrong
7) Bernie Sanders supporters are wrong
8) People opposed to Super PACs are wrong
9) Anyone who hates Hillary Clinton is a closet woman hating man (even the women!) and are wrong
10) Trump's tweets are wrong
…So on and so forth.
The democrats have proven themselves so incredibly tone-deaf that they underestimated a man who has had many years working in the entertainment industry…
…they purposefully shunned the wants of their own voter base (Bernie Sanders was a popular candidate - more popular than Hillary, and yet we hear the garbage about 'but Hillary was more popular than Trump' - nice selective application of popular there, you vote rigging bastards). By doing so, their own representatives voted against them in the Electorial College (because, surprise: they supported Bernie)…
…They ignored complaints of Super-PACs, corruption, vote rigging, which again disenfranchised the voter base. And now they're platforming extremist left-wing views that basically say 'ANARCHY FOR EVERYBODY! NO BORDERS! NO AGENTS! NO LAWS! REBBBBEEELLLL!' which is the kind of stupid shit I'd expect a 15 year old teenager with punk hair to do.
Essentially, their own arrogance in believing themselves always right, they got clobbered by a corporatist. If someone who is associated with the unpopular rich elite clobbers you in a popular vote, you know you are extremely unpopular.
And Trump is right, they are stupid. Their beratement of his '4th grade writing style' was a misnomer, because had they read any social studies, they would know people who use complex words or jargon, are seen as 'pretentious' - Trump was keeping his writings simple for the voter base. Something the democrats might consider when they go around trying to win over illiterate illegal immigrants who only understand pidgin English.
The man is only playing dumb. He didn't get rich by being dumb, though. And the democrats basically admit he won because he understood newer technologies better. It's why I think Q is Trump - the kind of play I'd expect from that guy.
Endlessly impressed by the fact an old man is upstaging everyone on the internet. Age certainly is no barrier.
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"Trump campaign's digital team outperformed Democrats at every level"
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David Brock, Media Matters:
https://www.scribd.com/document/337535680/Full-David-Brock-Confidential-Memo-On-Fighting-Trump#from_embed