This was the key failure of Biden-Harris.
Also, Harris (and Biden to a lesser extent) code as people who aspired to leave their working class roots. Trump has managed to portray himself as someone born to the manner but really has more in common with the working class.
I think they are generally stupid and worthy of their ridicule in The Onion, but when The NY Times does these “you voted for Biden, then you voted for Trump, how do you feel now?” pieces the respondents hit all the same notes. “The Dems are are snobs” and “they don’t care about me.”
David Brooks wrote yesterday that university graduates have silo’d themselves more effectively than segregation could from needing to mix with the working class, particularly in how we educate our own children (usually by keeping to communities of the like minded). You can see how that, at a broader level, supports the kind of presumptions that turns working class voters off.