If you look at the statistics black actors are actually overrepresented in terms of winning the acting awards, compared to their share of the population in the US. People like to frame the Oscars as this bastion of racism but it doesn't really hold up aside from two key areas: that the members are majority old white men and there were no coloured actors nominated the past two years. The Academy is taking steps to fix the first problem and I think what they have proposed makes tons of sense. They are never going to get rid of one racial group dominating the Academy but by introducing more minorities and, more importantly, women I think it will eventually lead to more consideration for non-white actors. The second point I don't think is racist, just unfortunate and spun the wrong way. There's five spots open in each of the acting awards and this year in particular there were at least ten actors/actresses who had a reasonable chance of being nominated in each. What, aside from their skin colour, makes Will Smith or Michael B Jordan any more notable than those who did get nominated?
Really the only snub this year, in my opinion, was Idris Elba, and that was for political reasons. Every other case this year of someone saying "this actor didn't get nominated, the Oscars are racist!" I don't see as a racial issue.
