If you would notice, Sherman at no point curses nor uses a racial slur. Instead he just yells. Also, he utilizes some of that communication degree and stares directly into the camera while speaking coherently. It just happens that he is yelling and describes Crabtree's skills as deficient. Looking at the habits of the 49ers receivers (looking at you Boldin) the trash talking probably went both ways throughout the game.
Back to the main point. At no point does he use a racial slur. Or Curse.