As D'Souza said, racism was considered to be the product of ignorance, which can be overcome. If these boys grow up to dislike blacks, that will be the product of experience, and that will be considerably more difficult to overcome...JFK
I know exactly what you mean. I grew up in a moderate-sized city on the East Coast. I'm mixed race (half Asian, half white), and I went to day camp with the Cub Scouts in a city park. Black kids from the inner city would attend. I was picked on by some of them, who called me a "ching chong," since they thought I was Chinese. Later, in the summer after my freshman year, I was riding my bike in another park with a friend of mine, and we got jumped by a group of black middle and high schoolers. The middle schoolers provided strength in numbers, and the high schoolers took my money, and punched me repeatedly in the face, saying it was "revenge for slavery."
The funny thing is, my dad was an immigrant, my mother's mother was an immigrant, and my mother's father's ancestors were Quakers, who were obviously against slavery. So my family, and myself in particular, had nothing to do with slavery.
To this day, I have a certain apprehension with most black people.