Some just shrink away, others lash out with vengeance, but I do think it is a huge societal problem, especially as the demographics of the country shift and white men may no longer have the majority in a democratic society.
Many democratic societies that are ruled by a minority demographic do not tend to survive, and so I think the transition from white majority to non-white majority is actually a fundamental issue for our democracy.
But about why people are upset about DEI, I think that has more to do with white people, especially men, not feeling well. Unless there's a huge portion of non-white people who have such vitriol towards DEI. I think maybe some of the Asian-American population, but I don't know about other segments. But im open to being wrong on that