And yes, I JADE a lot. To me, it's a common sense way of arguing...you make a crazy accusation up and I just have to accept it? No way.
The reason not to isn't about not defending yourself. It's that it's a waste of your time and energy to do it. Also, in a way it validates it. If it's not true, then there isn't anything to defend.
Defense is necessary when it crosses the line to slander, affecting your work or other important aspect of your life. In this case one needs an attorney.
But the ones where you are falsely accused of nonsense- it's a waste of your time. I compare these arguments to peeing in the wind. It all comes back at you. They project it or dissociate.
An exercise that helped me to resist JADE is to substitute something absurd for the accusation, like calling you a pink elephant. If someone thinks you are a pink elephant, it's so far out there, it's beyond the need to defend it.