Mockery is not always a sign of a defect in the thing being mocked. The tactic of mocking someone or their work is multi-pronged.
It is used to dismiss the person's work, so that others don't even take a look at it. It is often used as a political tactic to distract people from seeing the real [[fact]]s. It's a variant of [[ad hominem]], like saying [[scientist]]s who disagree with the [[United Nations]] are "in the pay of Big Oil"or saying scientists who believe in evolution are all atheists so their views can be discounted.
It is used to make the person lose confidence in what they are doing. "Ha, ha, you're [[stupid]]! Give up! You'll never succeed!" The idea is to bring someone down to one's own level, i.e., a "do nothing".