How do the emeeces we have studied criticised the REEL ?

One emcee we have studied who criticises the REEL is mos def. Mos def is a Brooklyn born rapoe who has socially conscious lyrics in his song , ‘mathematics’. One bar that expresses this is when he says ” Two columns for who is and who ain’t niggas “. How I infer that the REEL is being criticised is because he is describing that if you do not act the way black people are portrayed in the song you will not be classified as proper back person even though you are black and are not involved in selling drugs , being a savage and being aggressive. This is how the emcee I have studied criticises the reel.