Then I can call you a worthless piece of shit N----- and it's cool if I say "lol jk" after?

No. Again, context. That would come off as racist. The N word has no harm in itself unless it’s paired with an insult. Just like any other word. If a white guy wants to sing along with his favorite rap song I say go for it.

You know, the white people you're looking for approval from are just gonna treat you like shit, and I hope you learn that before you turn 20.

I don’t seek approval from anyone. I think other black people are making themselves weaker by getting so fired up over a coupler syllables. And I think white people being angry at other white people for saying the same word is more often than not just people trying to have the moral high ground rather than actually examining the issue at hand.