Using the so-called 'n-word' is not against our rules. We don't know the gender, race or location from a person in order to handle these kinds of things. All I can see in the screenshots are provoking methods from your side, trying to make him act more as he does. For that, I'm forced to give you a warning. If someone is violating our rules, you should take the screenshot and/or video, report the player on the forums and prevent any further contact with that person what so ever.
User will not be punished for this.