According to the GSS, white liberals are now as or more supportive of blacks being given “preference in hiring and promotion” over whites than blacks are. It is noted in the body of the question under consideration that some people say preferential treatment is wrong because it discriminates against whites. The question is framed to address a biracial pre-1965 US more than the polyglot America has become, allowing it to serve as a nice proxy for ethnomasochism among whites:
Black support has remained consistent over the last couple of decades, with just under half of blacks in favor of preferential treatment for themselves. White moderates (slightly liberal/conservative or moderate) and white conservatives (conservative or very conservative) have remained similarly consistent, albeit at much lower levels of support.
The Great Awokening among white liberals (liberal or very liberal), in contrast, is remarkable. Support levels lift off from 2012 and continue to ascend through to 2018, the latest year for which data is available. White liberals are now modestly more supportive of preferences for blacks at the expense of whites than blacks are, and it seems more likely than not that the gap between liberal whites and blacks will continue to grow into 2020 and beyond.
GSS variables used: RACECEN1(1)(2), HISPANIC(1)(2-50), YEAR, AFFRMACT(1-2)(3-4), POLVIEWS(1-2)(3-5)(6-7)