I will admit to commenting on the LJS site. Mainly I wait until they work up a good head of steam then poke huge holes in their arguments. There's nothing like facts to take the fight out of them. Of course I have a long list "ignore, do not respond to" names.
You never win an internet argument, but when I have to throw something out there and I know it will be attacked it helps to nail down your facts as good as possible. Then they can either a) drop it, or b) resort to ad hominem attacks. Either way I know I "won".