The dickhead was participating in what was, probably, a retarded fanboy flamewar on the internet between CoD fanboys who are, ostensibly, the lowest common denominator and Battlefield fanboys who are, ostensibly, the second-lowest common denominator who have managed to convince themselves that they are the hyper-intelligent shooter master race. Anyone who will condescend to participate in such a flailing moron-fight deserves the inability to play the precious game he was probably spewing obscenities and slurs to defend.
Seriously, go EA. Ban all of the people who spend the best part of their time being morons on the internet and arguing with other morons from your games and you have my unending respect. Before anyone goes right ahead and argues that I'm generalising, I would like to argue that I have seen far, far too many arguments of this sort on the internet to believe that he was banned for educated discourse of the shooter genre.