Perhaps I'm unfamiliar with how this works, but doesn't !vote allow a popular vote to decide what happens? In which case, would he be the sole one at fault here? Also, (assuming that people get to vote) wouldn't the vote of many "no" override a "yes"? Just trying to figure out how he managed to do this all by himself.
Unless I'm missing something still, I (personally) do not see where this guy deserves anything more than a "hey don't do that". Unless he does this super frequently, I would just be the bigger guy and not let it get under your skin.
On a different note, this statement is quite a few degrees worse than "trolling".