Oh dear, don't ask ME - last time I had to explain it to DD (then 4) I ended up ranting about Jesse Owens, Hitler and the black power salute......

From my mum "some people are just limited"

Although I do think it depends on the moment in time that it happens, maybe you can tell them people are afraid of mummys STYLE.

I can't really remember what I said each time it ever came up, but I did try to show some sort of empathy for those that "didn't understand" or "get it" or were actually afraid because someone told them lies....