I disagreed or would have disagreed on the basis that "Democrats abandoned these groups". I don't think that's true.
But Democrats as a whole are horrible messengers on a good day. Although I personally think a lot of that comes down to Democrats having an inherently more complicated platform. For one obvious reason trying to appeal to more kinds of groups.
Chrkeller mentioned Buttigieg, right?
I was going to point out that Tammy Baldwin won in Wisconsin despite being openly gay and a woman, and did better than Harris did.
I don't know if Buttigieg would have made a difference, but I think he's a very good messenger.