I wouldn't warn people to not do something if they weren't actually breaking any rules. I had warned the server for racism, and then specifically warned another user who said "nibba," in chat, stating that racism is disallowed so by extension no racial slur variations. There was no reason for you to question that, nor break the rule I had clearly warned against. You had even originally filed the CallAdmin for "Racism" that I was responding to. Given your past history of bans, along with this violation after I had clearly warned against it, you will not be unbanned and in fact you've been placed on a week suspension which is your final warning before a permanent ban.
Appeal denied.