Many ideas seem odd (or are even declared falsified), but are later seen to be valid, and vice versa. Therefore, precise argumentation is a good idea, even towards people whom you do not judge as qualified. If you cannot be bothered, at least refrain from sneering.

For example, keeping copies of important data on paper can be a good idea for various reasons. Encrypt them if necessary. As for ex-Mrs.D's bathtub drain, I would not be too sure either. Besides: Why is she ex? (No answer expected.)