Luckily I haven't had many experiences with this due to my early purchase of Blockland. You see at a point where everyone is exploring and learning the mechanics of a game, there's no room for calling others nubs. But I do recall some issues with Blockdude and his older brother... what'sHisFace. They started making their own Ninja Challenges after I rejected them from my old Ninja Clan. In anycase, they're not much of an issue anymore. I can't even remember the last time I was banned, come to think of it.