If the person you directed faggot to did take offense, then yes it's considered sanctionable because it's an offensive/really insulting slur.
Anyways though, if you were banned or muted for saying "faggot" then you may have been IP banned to prevent you from ban evading.
If you think you've been unfairly sanctioned you can contact your community's administrator as well as to find out the moderator who banned you.
The reason you can say fuck is that the game does allow swearing that's not directed like " fuck you" /directed but the person it was directed to does not take offense or they are joking around as good friends.
Thread closed.