how do i teach a young one to ignore racist statements at him?

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i've got this genuine problem.. i'm an active volunteer at a local home for neglected children & orphans. last weekend while going over some of their schoolwork and catching up on their activities, one of the young boys was sitting and crying in the corner. he was a bit scared or shy at first, but after much coaxing & promise of treats, he finally told me why he was crying. apparently while he was out in the playground this morning, a passer by pointed a finger at him and shouted out a very offensive racial remark. now this little boy of 6 years knows what the remark meant. he was crying because he knows that it simply isn't true, and that it hurt his feelings. and it must have been quite traumatic for him until it's effecting him like this. i honestly didn't know what to say. i left the home in the evening all perplexed about the situation. now i've been through quite a bit myself. but lucky me, my parents were there to shield me from all the world's nonsense when i was just an impressionable kid. i've learned to let racist & negative comments just fly past me without effecting me one bit. maybe that's just me and the way my parents taught me. but what can i do for this little boy now? it's so unfair that he has to grow up so fast in order to deal with the nonsense that some people spout out. he should be learning & playing, instead of being worried about racist remarks and such. he's usually has a playful & colorful character, but after last weekend he's been so withdrawn into his own world, thinking about what he went through. hopefully someone here can give me ideas on how can i assure him, and hopefully teach him a trick or two about how to ignore ignorant people. myLotters, heelllp! i've seen that some of you do have some good advise for different situations. hopefully there is one useful for this little kid..