Here's a very important question you need to be asking yourself: would you be more offended if the white world not only never admitted there was a time when that word was totally okay, but in fact never learned that it had happened?
To understand how far you've come, black or white, it's important to understand where you began. Huckleberry Finn was written before the Civil War. And Huck's use of the N-word is in fact crucial to understanding the context of his story.
Racism hurts everybody. Not equally, but it does hurt everyone. Huck Finn is a KID. And, if you'll give the book a chance, you'll find that Huck's heart is nearly always in the right place and a fair guide to him, even when everything in his world and society tells him the opposite.
That's really ...kind of the entire point of the book.