I know it's hard to stay civil when people are being purposefully insulting. I think I understand Tamara's point though. We're just sinking to that person's level, and then all the newbies and folks browsing read the posts and think we're all rabid.
IMHO, our best bet with folks like "that one" would be to reply with a simple "There have been numerous posts citing perfectly valid reasons why BLS won't work. Please review them at your liesure.". How frustrating would that be for someone looking to start a fight?