To piggyback this, there are documented instances of idiots going to twitter and blatantly calling Sherman the N word. Others have used the word "thug". I could link them, but you all know they are out there. However, I don't think this is a race issue, upon reflection.
I believe that the outburst was pure emotion and adrenaline and I, for one, am ok with that. People lament the No Fun League continuously, but here we had a guy who had won a battle vs. a much hated opponent he had a history with. The media played up the hatred and rivalry between these two teams all year and all week leading up to the game. The fact that some were put off by the very emotion they were hyping is hypocritical.