I think what LuisCypher tried to point out here is this: You shouldn't call for bans too quickly. There are always two sides to an argument. Who acted, who reacted? Who decides on the line between ban-worthy and not, and who says who crossed it first, if at all? It is very easy to overreact if someone shows provocative behaviour. Which may be the point, actually - getting your opponent off balance gives you an advantage in poker. If you really can't stand someone, just use the ignore option. And if other people keep talking to him, hide the chat window. That's what I do.
And for most people in today's internet, IP-Bans (at least for IPv4, which pretty much everyone is still using) do about nothing. Restarting your router (or unplugging the line) gets you a new one. Even the most computer-agnostic player can do that (and probably will, if he can't connect, even if he doesn't understand why or how this fixes it).
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