Trend these days is to encourage openly being a bigot, just as long as it’s against certain people.
Replace the word white with any other social group and perhaps you’ll see the problem.
"White" as what you call a "social group" was created in service of this power dynamic. Before, say, about 400 years ago, whiteness was not an idea used to identify a "race" of people.
So yeah, I'm all for being less white. I'm fine with just being like ... Irish.
You can research the history on this pretty easily, but a good place to start is a podcast series from Scene On Radio called Seeing White. My memory is a little fuzzy but I think the broad outline is correct.
As someone who remembers being told, as a child, their father was stupid because 'Irish people are stupid', DiAngelo's work makes me feel exactly the same way.
If you're interested in doing some more research of your own I can recommend: https://en.wikipedia.org/wiki/Cynical_Theories