Prompted from seeing this user.
Is there a standard for what constitutes an "acceptable username"?
Also what would be the appropriate response to seeing a potentially offensive username? Raise a meta post, or custom flag on their question/answer?
Flag any post made by the user (since you can't flag profiles directly) with a custom message to the mods explaining that the username may be problematic.
I've reset the username on this account this time.
Travis J wrote in a comment:
Usernames must abide by the Be Nice policy, which while open to some interpretation, is often rather easy to determine if a violation exists - especially when reviewed by experienced community elected moderators. Specifically, this clause applies to this situation: "Inappropriate language or attention. Avoid vulgar terms and anything sexually suggestive."