Indirect Death Threat

So, first off I'm including three links because he the Graves wrote it in the end-game chat, and unfortunately it's a very small square.

Now, what he said is that "IP is very easily tracked" and that asked wheather I've heard of unintentional suicide. I joked about playing this game, because this guy was obviously very upset about the losing the game. Then he said we'll meet again... soon

Obviously this is an empty threat, but I still felt uncomfortable and decided to make a post about it, thanks :)