This kind of filtering and censorship is way overboard. It doesn't matter if some of the players here belong in Kindergarden, this aint school and you arent the teacher. People will find ways to say the same thing no matter how many times you filter it. If you block every possible variation they'll still say "dirty black person." What next, are you going to disconnect us if we think bad thoughts?
Deal with this on an individual basis instead of taking the bullshit way out.