"Uncle" Jeremiah, B.O., & Black Churches

Obama offered a slick speech the other day, trying to recast the hateful-pastor/mentor/"uncle" controversy in the least damaging light. But he immediately turned right around and threw his White grandmother under the bus, calling her "a typical white person" who, because of having been "bred" that way, fears people on the street. Oh, well..it's "just words"...
The problem with huddling together for twenty years with a congregation who thinks just like you is that eventually, you might not know how strange--or even offensive--your thoughts could be to the general public.
The existence of Black churches itself is, in my view, evidence of racism. No more than a very few non-Black churches are shunning Blacks. I've had many Black friends inform me that Black people are much more likely to be racist than Whites.
Admittedly, I've never been in a Black church, but every church I have been in is extremely welcoming to every visitor "of color". I hate the separation, and I think all White Christians agree with me, as do those of other racial backgrounds in non-Black churches.
Why can't we all just get along?