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.
While it’s true that people don’t understand what “white” is, that’s no reason not to do the right thing. Be less white.
It doesn’t mean any of us as white individuals have to feel bad.