Fisher like his mentor Deleuze was hostile to the dialectic and thus like a good deleuzian could find nothing worthwhile in hip hop after it had ceased to be modernist. no room for negativity.
But a fully grounded critique of popular culture has to make room for the distasteful, the mass produced, the kitsch, in short the unpalatable.
basically through the excessive formalism of innovation he ended up at an antiblack position. but all dialecticians realise that art objects specifically come to acquire their meaning in the encounter of the human with the reflection of her ideas back at them in the object. in this sense art possesses a limit, which is not merely extrinsic but intrinsic.
art objects as things in themselves if such a thing was not a limit of reason to be overcome, would merely evacuate them of content, they would contain nothing at all.
Thus even the concept of popular modernism as being discussed cannot be said to be something a priori, but precisely acquires its definite content through the synthetic method.