It’s shown quite clearly in the ban description that there was no “/” before your slur.
Also, if you had added a “/” before it, it wouldn’t have banned you since it would be a client-side command input and not publicly visible, nor an actual command.
But what’s the motive to say it in the first place? It seems very insensitive of you, especially with it being in all caps, which tends to express yelling/aggression.
Convince me why should I believe that what you said was due to “curiosity” and not malice?