The original article cited in the thread was down on the movie because it was racist against whites, but tried to pretend it was because it was patronizing to people of color. The crap about white guilt is just to denigrate the motives behind the movie. The Good Role Models for White People aspect of the movie is what they disliked.
I'd argue that the term "white people" is itself racist. It lumps a very large, very diverse group of people all in together based purely on the colour of their skin.
There are significant cultural differences between "white" people from the north and south of England, and that's just in the same country, all within a few hundred miles. Italians and Latvians aren't the same, Danes and Irish aren't the same.
Frankly, I don't care what the motives were behind this movie. I don't care what the motives are behind movies from black directors that portray every white character as a racist either.
Movies marketed towards a particular group always end up portraying everyone outside that group poorly.