So far the only example of harassment has been from a free to play MMO. Any game that is free to play will draw in some of the worst people around. That subscription alone cuts a large portion of potential trolling players.

I'll compare to WoW again, primarily because it was my longest MMO experience. I played on several servers, and not once did I ever experience any form of harassment from declining a duel. The worst I got was a few cry or laugh emotes and then they went to duel someone else.

But thankfully Yoshida has a high interest in PVP and there's a good chance that'll be implemented in the future. I'm expecting it to be a que of sorts for Coliseum, and that's fine, because right now it's non-existent.