The lesson for Democrats is surely that after years and years of telling anyone they could find that had concerns about society "oh you must be a literal Nazi, cope harder la la la la whoop whoop air high fives and fist bumps that's roiiight ma BOI!" at some point these people are going to turn around and say "well ok then, I just won't vote for you because you have nothing to offer me".
I'm not saying the Republican party has done this any better, but surely insulting potential voters en masse and refusing to understand their concerns isn't a sensible way to win elections. I didn't work for Hilary either, and it hasn't worked for Harris.