Jay-Z's DOA

In Jay-Z song DOA his lyrics mostly contain protests of hip-hops purity, and how it should go back to how it once was. Which, I agree with, then he fires a line aimed at kids like what, 13-25."No lyin, your niggas’ jeans too tight Your colors too bright, your voice too light I might wear black four years straight,"Why would Jay-Z, a buisness mogul and a world-renowned rapper, diss kids, and then go on a temper-tantrum about how he'll wear black for a year straight.
Still my fav rapper though