Although I'm pretty liberal about most things, a new user, rectumrectifier, has a name which is a little childish, if not mildly pornographic.
How is this approached by the admins on AskDifferent? Is there a standard for usernames?
If you find that something about a user is offensive or inappropriate outside of any particular post, flag any post from that user with a custom flag.
There is more leeway with what is allowed in the About Me section of a user's profile as this requires a click-through, however avatars and names are subject to removal if deemed inappropriate.
Related on Meta.SE: Inappropriate username and/or gravatars.