First of all, it is hard to say that there are really negative trends in white attitudes towards African Americans today. I would argue that there is less racism, discrimination, and prejudice today than there was thirty years ago.
That said, things are obviously not perfect for the African American community. The trend that I see as the most negative is the continuing trend towards high incarceration rates for African American men. If this trend keeps up, the African American community (at least the parts of it that are at the lowest end of the socioeconomic ladder) will be even more depressed. There will be even fewer stable families as more men are removed from the "marriageable" pool because they are in prison or have a hard time getting work due to their status as felons.
I would argue, then, that the trends in race relations are not uniformly negative. However, there are trends that clearly point to the possibility of a decline in the status and situation of African Americans in the underclass.