[kls]

Did you first approach him about the fact that you viewed the content as unfit for the site? If not that should have been your first avenue to deal with the issue. If you did and he persisted, then you did the correct thing. If he continues to call you out in public then I would release a detailed chronology of the events that transpired and let the users be the judge. If you did not approach him before hand, I would extend an olive branch offering his account back with an apology that you may not have pursued the best means to find a common ground along with the understanding that he agrees to not post such content.