I think Crab is wrong to suggest that Democrats should actively downplay racial issues.
I don't, however, think it should be so controversial to suggest that a non-trivial minority of Trump voters, mostly Obama/Trump voters, are if not "not racist," sufficiently soft in their racism that it is possible to win their votes without pandering to said racism.
I mean, sure, I guess. I don't trust those people since they voted for a white supremacist and that's kind of a key issue for me. But maybe they can feel bad about it and repent.
Here are some things I believe:
1. Social justice and economic justice are not opposed, they're linked. We should be arguing for both without leaving either behind. Call it solidarity or intersectionality, it doesn't matter. Basically just run Jesse Jackson.
2. Some people are worried the Democrats will go soft on economic justice (or already have) and some people are worried the Democrats will go soft on social justice (or already have). These people tend to view each other as opposing the two issues, which creates conflict. It doesn't help that there are people in both camps who do actually oppose the two, but I think not the majority in either. But, you know, it's a good idea to be clear that you are advocating for both, rather than just one.
3. Clinton did not lose resoundingly. She lost an extremely close election. It was close enough that weather could've made the difference, to say nothing of emails, Russia, intraparty conflict, being old, or any of the other countless factors that contributed. It's not a good idea to assume drastic changes are required in response to a close election loss, no matter how shitty things are.
4. White supremacy is bad, etc. People should take more time to be horrified that everybody in the Republican Party was willing to vote for a white supremacist because he was running as a Republican. That is the biggest reason Trump won.