I can tell you why. Its pretty obvious, when Fuel says the N word, who is he targeting? Who is he calling the slur? Nobody? Alright then.
The difference with Frisco is, when you say something targeted to a player, that is indeed bannable. Why do you think Pedo Accusations are bannable? They are targeted to a person or a specific group of people. Fuel being a stupid fucking child and saying "haha n word" isn't targeting players.
Do you see the difference here? When your comments aren't talking about a member of the server in another server, they do not care.
When a comment is made about a player of TITSRP in a different server, the staff _will_ do something about it. Do I think fuel should be using this word? No. Do I think fuel should be banned for saying this word outside of the discord when not targeted to anyone from this server? No. Do I think fuel should be banned for calling a user a stinky slur? I'm not a staff, but I'd say that would be something report worthy. Why do you think Cock Asian got punished? He went out of discord, yes, but it was in relation to this server, and harrassed some children who play here.
I have the feeling that there is something you aren't grasping, or are ignoring for the sake of argument.