This is from the film "(Astro)Turf Wars". It shows a training session for how to sabotage the dialogue and "control the debate".
But one of the first lessons in anti-propaganda tactics is to learn how people practise it and be able to spot it. Then, you can say "that is propaganda and not really worth paying attention to". Additionally, you can use critical thinking skills to spot the flaws in their arguments.
In this case, the trick is called "stacking the deck" or "card staking" where one emphasises on argument while eliminating another.
But, the next time you see a book with polarised reviews, you can be aware that it has probably been hit by this tactic.
The film is worth watching.