The sift allows negative voting on comments, but not filtering out a poster. Think I'll look into a GreaseMonkey script to filter out based on commenter. Spreading negative waves may be theraputic for them; reading them is anything but.

2. Silence: Speak not but what may benefit others or yourself. Avoid trifling conversation.

6. Industry: Lose no time. Be always employed in something useful. Cut off all unnecessary actions.

9. Moderation: Avoid extremes. Forebear resenting injuries so much as you think they deserve.

12. Tranquility: Be not disturbed at trifles, or at accidents common or unavoidable.

http://www.flamebright.com/PTPages/Benjamin.asp