I disagree. Teaching children about literature, past and present, is an important part of their rounded education. Huckleberry Finn is not a HATE novel. There are valuable lessons to be learned in that novel whether you are white or black. In this instance, the parent would have been wiser to be an educator for the child rather than a sensor. This was a valuable, teachable moment for this parent, and this parent chose to fight rather than teach.
Who said it was a "HATE novel"?
That's not the point.
Since when does a well "rounded education" need to include racial slurs?