I disagree. Online ranks are meaningless, time is precious.
And teaching a slow player a lesson is invaluable.
What lesson?
That slow playing doesn't earn them rating points. Teaching them the opposite lesson, however, is harmful.
An individual however, cannot prevent them from learning that they can achieve rating points (or perhaps simply enjoyment derived from the rage of others, if that is what they are seeking). Even if you have the patience and available time to combat them, there will always be others who cannot, or will not. If this was not true, these people would not abuse the system in this way.
The only thing that can eliminate this behavior is removing the loophole they use to abuse the system. A perfect system may be hard to achieve, but it has to be trivially easy to have something significantly better than what exists.
If you have the desire and available time to fight back against this type of player, by all means do it. Even if it only prevents them from moving on to their next victim for a little longer, you are doing the community a service. It is unlikely however, that you will convince them to stop their behavior while the system still allows it.
