We're already seeing the seeds being sown for blaming them for a Biden loss.
"YOU WEREN'T CIVIL ENOUGH! YOU MADE US LOOK BAD!! THOSE SUBURBAN REPUBLICANS TOTALLY WOULD'VE VOTED FOR US OTHERWISE!1!" they'll screech.
Democrats/libs will never blame themselves for losing, only others. No matter how blindingly obvious it is that their pride and arrogance cost them victory yet again.
Like Hillary Clinton, one of their gods: They can never fail, only be failed.
Maybe a way to fight this is -- in the middle of a conversation where they're speaking in platitudes about how they like BLM but don't support violence or whatever -- ask them what they're willing to give up to support those fighting for something resembling a justice system in this country. Make it real to them: are they willing to donate to a bail fund, are they willing to show up and get gassed by the police, are they willing to pay higher taxes, etc. Push on their stated beliefs from the standpoint of "if you really believe in it, you would do something about it, right?" Wherever the conversation goes from there that might echo in their head while they're just posting and posting and doing nothing else.