I'm pretty sure the ORIGINAL definition of the 'n'-word was as follows.
1 usually offensive; see usage paragraph below : a black person
2 usually offensive; see usage paragraph below : a member of any dark-skinned race
3 : a member of a socially disadvantaged class of persons
usage Nigger in senses 1 and 2 can be found in the works of such writers of the past as Joseph Conrad, Mark Twain, and Charles Dickens, but it now ranks as perhaps the most offensive and inflammatory racial slur in English. Its use by and among blacks is not always intended or taken as offensive, but, except in sense 3, it is otherwise a word expressive of racial hatred and bigotry.
Quoted from M-W.com. Merriam-Webster's dictionary.
Think before you speak. I don't see the word lazy in there anywhere. People like Chris Rock, etc made up that whole "difference in black people and niggers" bullshit. NO, I'm not saying 'there is no difference'. I'm saying it's not ok to pick and choose the difference between the two. If you're using that word, you're only exemplifying your own ignorance. You think early American slaves were lazy? Doubtful, laziness would get you beaten or killed. Quit pulling things out of your ass.
Micheal Richards sucks at stand-up and has a short temper and probably ended any career he had with that outburst. He was probably heckled mercilessly because he probably wasn't too funny.