Consider it a readjustment period
For most of history it was just fine for whites to preach against non-whites on Sunday mornings. I'm sure it's acceptable still in some places, unfortunately.
But because there are racist scum still out there is no excuse for the likes of Rev Wright and his ilk, he is just as bad.
It seems institutional racism's end may have led the pendulum to swing a bit too far in the other direction with regard to what is acceptable in racial attitudes. Maybe this Obama business coming to light will begin the process to make reverse racism just as unacceptable.