I disagree.
DEI unfortunately resonates with average voters, particularly in many of the swing states.
Think about all of the people who vote against their own interests in favor of the billionaire class. Why? Because they think they have a real chance to be the next millionaire, etc and they want “freedom” to attempt such a feat. Statistically, most will (utterly) fail at making it “big” or becoming ultra wealthy. And failure is a difficult pill to swallow for any human - which is why everyone loves to point fingers, particularly at politicians, when their lives don’t pan out the way they envisioned as the American Dream.
For many voters, DEI is an easy bogeyman to project their own failures onto. Even many young white liberals hold these kinds of views. Go look at the college and graduate school admissions process and you’ll see many “liberals” who found affirmative action to be “unfair” or use AA policies as the excuse as to why they didn’t get admitted to some prestigious college.
Again, I think many still underrate how engrained racism and sexism is in America. The biggest reason we have a Trump is because a Black man was President. Trump may be a buffoon and have turned off many voters, but the DEI accusations at Kamala will sting a certain set of voters that may decide to sit out instead of voting for either.