just have an ignore list like vbulletin where you can ignore all the posts of users you don't like.
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DeskPRO.com http://www.deskpro.com?r=gt
vBulletin.com Moderator and Support http://www.vbulletin.com/
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DeskPRO.com http://www.deskpro.com?r=gt
vBulletin.com Moderator and Support http://www.vbulletin.com/