He quoted an entire, extremely racist essay to support his point. That way he let somebody else argue in his stead, without getting his hands dirty. Example:
"Blacks are keenly interested in their own racial characteristics."
"Blacks break down the intimacy that can be achieved in the classroom"
"One point on which all blacks agree is that everything is “racis’.”"
"Anyone who teaches blacks soon learns that they have a completely different view of government from whites."
"Blacks are extraordinarily quick to take offense."
"But the real black is not on television..."
There's no way you can take these statements and say they are anything but flat-out racist. It's one thing to say "This is my experience in a certain school with black students" and it's another thing entirely to say "Blacks are." If the author is telling the truth, then he mentions many "facts" of his experience.
However, he doesn't settle for merely reporting it as his experience. He skewers those facts - with intent - into de-personalized blanket statements.
Which are clearly and irrefutably racist:
"Racism is the belief that race is a primary determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race."
http://en.wikipedia.org/wiki/Racism
Him allowing that there might be a few "specially sensitive blacks" doesn't excuse him from racism.
Now, again, the author of the "essay" in question quoted this other author more than at length -- he quoted him in full. While he studiously did not MENTION the entire essay length piece embedded in his blog post, he clearly condones it. There's no way around it: racist, of the highest degree.