Nor did I, and I was living in FL at that same time period. I think Ernie has a highly imaginative memory.
I also think his memory is highly selective. I don't remember seeing any trucks or cars flying Confederate flags in the city where I lived during that time. But I do remember very well the plumes of smoke rising from American cities where mobs of rioters were using racism as an excuse to burn buildings, loot stores, and beat to death white motorists who happened to blunder into their neighborhoods. If any kids should have been afraid of another race at that time it should have been white kids who lived in or near black urban neighborhoods. They had much more reason to fear a rioter carrying a brick than black kids had reason to fear a truck flying a piece of cloth.