It is when it ignores class and takes people of different ethnic and economic groups and treats them as homogeneous based on skin color alone.
Class isn't immediately visible. Skin is.
You mean just like a racist society does (which makes the statement even more accurate)?
Because even a "rich/european/etc" black person is still a n... when it comes to a racist society, and while his experiences might be better, they'd still be shaped by racism.