I agree “white” is a made up category that isn’t meaningful. But the same people who do the trainings will perpetuate the concept of “white” by talking about “white people” versus “people of color.”

My daughter has four “affinity groups” at her school. “Black girl magic,” “young black men,” “BIPOC,” and “LGBT alliance.” A teacher recruited her and some Turkish kid into “BIPOC” because they have no other non-black non-white kids.

It’s not just a demonstrative analogy. The people running these diversity programs think theses groups are real.