Fundamentally this is a desire for a return to the exclusionary grand bargain from before the Civil Rights era. Democrats abandoned that grand bargain in the 1960s, and a lot of white men have never gotten over the idea that they need to share political power with anyone who doesn’t look like them.
I agree with Edsall: Dems should try to win without the support of women, minorities, LGBTQ people, leftists, or people who need/support social services and/or are concerned about gun violence. Surely there's enough rich white straight male reactionary centrist columnists for an electoral majority!