>Try to get a single Democrat to acknowledge this. They are still belitteling [sic] and stigmatizing those who share these concerns
This is half-wrong. What you, and most people on the right, fail to see and understand is that (just like the right), the left is divided into different camps. In this election, the Democratic Party was clearly shown to have two main camps: the "Progressives" and the "Establishment". Hillary's staunch supporters were in the latter camp, and Bernie's supporters were in the former.
The "belittling" you see is from the establishment Democrats, who are mostly people actually IN the party (not just voters) if you're looking at stuff in the media, or are a small number of actual voters. Quick question: how many Hillary bumper stickers did you see last year? I barely saw any. In fact, around the DC area, I saw far more 2008/2012 Obama bumper stickers (in 2016!) than I did Hillary stickers, right up until Election Day. There just wasn't any enthusiasm for Hillary at all, except for party faithful. Maybe the DC area isn't representative of other Democratic strongholds in the country, I dunno, but I thought this was telling.
Anyway, the point is, talk to any Bernie voter and you'll very likely have complete agreement about the establishment Democrats refusing to acknowledge the concerns of many Trump voters, and about how utterly out-of-touch Hillary and her side of the Party were.
Now, the following is all obviously my personal opinion and wildly speculative at the end; the sad thing is that Trump won by claiming to be anti-establishment and winning votes from more conservative people, but in reality he's going to be mostly pro-establishment: just look at his AG pick Jeff Sessions, who's pro-police-shooting-unarmed-people-in-the-back, pro-private-prisons, and anti-marijuana-legalization-and-decriminalization. Trump is pushing budgets and tax plans that favor lower taxes for rich people. The Trump voters voted for Trump mainly based on racism and xenophobia, as best as I can tell, and would have been much better off if they had organized, registered as Democrats (in states where you have to do that to vote in primaries), and voted for Bernie, and then elected him in the general election. He was the one who really addressed income inequality and other issues of real concern to the lower and lower-middle classes. Politicians like him, widely regarded as honest but also clearly seeing the issues that need to be addressed and having enough popularity at the national level to get elected, don't come along very often, and we've probably missed our shot: Bernie is nearing 80 now and isn't likely to be feeling up to another Presidential run in 2020. Most likely, we'll have either Hillary or another really lame Dem candidate run, they'll lose to Trump, and the economy will continue its downward spiral. This will eventually end up with the dissolution of the US and large parts of the country (esp. the South, probably also the Northeast) will be much like Italy: formerly economically powerful but now relative backwaters infamous for corruption. The west coast cities may stay economically powerful after forming their own independent nation, or may be get dragged down. Long-term, I'd say that China will be the new world superpower in 50+ years. There's probably an alternate universe where November's election turned out very differently, Bernie won, and the US and the rest of the West avoided collapse, but we're not in that universe unfortunately.