you know, it is fine to say if you're black and refer to another person in a cordial manner as the N word. it has changed. but it isn't a laughing matter when white supremacists and neo nazis and bad motherf**kers say it.
people say it because they have the veil of anonymity that comes with being online. they say it for misery or to assert their false claims of supremacy to everyone else.
racism is still alive and well and personally it's rather annoying to deal with these people.