I recognize that you were "making a joke" however that doesn't change the fact that the substance in which you were joking is taken very serious. There are other topics that aren't to be discussed such as racism, homophobia, DDoS, and personal information. There is other instances in which a joke was being made- here was a recent case of this:
https://forums.garnetgaming.net/index.php?/topic/22437-my-ban-appeal/
In this post, the user made a joke about "having someones IP" and he was permanently banned. Why should your report be treated any different? The fact that it was said to a minor in this case doesn't really help. I'll let higher ups decide, however this is how I feel.