The Democratic Party would be making a big mistake if it focuses on helping the white workers whose pay has gone down in the past 3 decades.

I agree with the article's conclusion, but we should not suppose that right-wing democrats abandoned white workers because they were focused on nondiscrimination. It's more the opposite: after Bill Clinton sold out to the rich in the 90s, mainstream Democrats would no longer offer a New Deal, so nondiscrimination was all they had left.

When dooH niboR is making the non-rich poor, if they are not wise enough to see this, they tend to break up into groups that compete with each other. Especially if right-wingers encourage this and nobody discourages it. But if Democrats offer everyone a chance to have comfortable a life, they can work together for that.