You can read about it in the New York Times.

Edit: This is interesting too.

It’s disingenuous to claim that this is all there is to DEI, or that this is the kind of thing that DEI opponents are actually opposing.

Oh and also the ADA was a thing before DEI, all this is covered by the the ADA, and I don’t expect that most of the people opposed to DEI are also opposed to the ADA.