Is that the left is not insisting on the supremacy of women, minorities or religious groups. This is a caricature pushed by the right. Indeed, Trump and Republicans have repeatedly pushed the victimization of white males such that often vote as a block regardless of how anti-working class Trump's policies.
The left is simply opposed to discrimination and voter oppression. Likewise, Democrats, not Republicans, are the ones who have supported working class families. However, we CANNOT ignore the concerns of women, minorities and religious groups, because they are often scapegoated by the right. Put another way, Republicans oppress white men by creating this myth that they are being oppressed and crowded out by women and minorities. Racism and sexism becomes the new populism as Trump and Republicans validate the racist and sexist beliefs of white men by blaming immigrants, minorities and the entry of women into the workforce for their oppression. Working class white men, thus pay for the privilege of feeling victimized as Trump and Republicans then pass laws taking away their benefits to fund tax cuts to the rich.
Rather than ignore issues of race, gender and religious oppression as Bill Maher and Bernie suggests, Democrats need to point out that racism, sexism, and religious discrimination is the other side of the coin of oppression by the rich. Trump and Republicans preach hate designed to allow white men to feel both victimized and privileged at the same time and, in exchange, the working class looks the other way as Trump and Republicans take away benefits that they depend on.
Beware of members of the left suggesting that the problems Democrats are due to their efforts to protect women, minorities and religious groups. Protecting white working class voters and women, minorities, and religious minorities are not mutually exclusive.
Indeed, protecting their voting rights will be vital to Democratic efforts to regain political power.