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Racism/Discriminatory Behavior: Avoid at all costs, insulting someone's country, culture, lifestyle or skincolor. Even if you are just "joking" it isn't allowed. Slangs such as the n-word aren't allowed either, even in Guild chat. Don't blame guildies for reporting you. It's wrong and you should know that.
It's unlikely that you were falsely accused. To report you there must be some kind of proofs - screenshots or video. But they won't show you those and probably won't tell you what you said to protect identity of the person who reported you.