I struggle with this a lot so thanks for the hint. I don't entirely agree that good points stand on their own. It's often easy to anticipate the criticism to your point. When arguments are text-based and responses have a tendency to span hours or days, it can be useful to short circuit the argument by just calling out the anticipated criticism. This of course can sometimes lead to comments such as yours, where we go off into a meta side-argument. Or, if you anticipate badly, you unintentionally put even more focus on the anticipated criticism than your original point.