Comment by stillbourne

The point is when someone has already established themselves as an idiot its pretty easy to dismiss them. The utility SirensOfTitan's comment is informing us that the person in question has already established himself to be an idiot. It is therefore relevant because anything the video says is already suspect, it can easily be dismissed. You don't have to go far in the video to establish this as the first statement in the video is a balance fallacy.