I agree with @L.Dutch, but I'd also like to make a point.
Sticks and stones may break my bones but words can never hurt me
I was taught that aphorism a very long time ago, but it seems no one teaches it anymore. We live in a world where, increasingly, the offended believe they have overwhelming rights.
A dear friend of mine was once told that he should stop his use of "ma'am" and "sir" on the grounds that they're "gender hate speech." It didn't matter to them that he'd been raised, both individually and in a society, where the use of both words were intended and expected for honorable, respectful, and civil discourse.
It's certainly true that we should act conscientiously to avoid hurt feelings whenever possible. But I'm not a fan of the concept of equity. I'm a fan of the concept of equality. And that means that if it's reasonable to expect someone to act in that manner, then it's just as reasonable to expect people to conscientiously avoid taking offense. Other than the two comments to the post by User 89947 (who owned the moniker), we've not heard a thing from the user in question, but I'd be more than surprised if the choice of moniker was nothing more than an attempt at humor. His/Her explanation for the choice might even add to the humor. Frankly, we're fortunate he/she is being so good natured about all this.
And before I go any further, let's point out that this Meta discussion singling out a specific user in a way that demotes what was likely nothing more than an attempt at humor and vilifies for no better reason than someone took it personally is also a violation of the CoC.
So, yeah, the choice of moniker technically violates the CoC. It would have been better handled using the Contact link at the bottom of every page or using the flag link following every post to tap a moderator on the shoulder and bring the issue to their attention in a way that promotes true peace, unity, and tolerance.
So, please consider the following:
Sticks and stones may or may not actually break your bones, but words spoken in a free society that celebrates diversity of opinion as much as diversity of culture, ethnicity, race, and belief really and truly cannot hurt you — unless you let them.
If your irritation over someone's moniker is the worst thing that happens to you on any particular day, you had a great day.