The title is an example of overly aggressive questioning and a fallacious attempt to end debate by labeling anyone who disagrees a dunce. In a courtroom the question would be disallowed on the legal grounds that it is argumentative. In the newsroom, the boardroom, and just about any other type of room where people gather to discuss issues, that type of question is asked every day.
Walton clearly (but ponderously) explains why questions of this type (and questions and arguments of many other types) are just plain wrong and shouldn't be tolerated. He not only explains why they're wrong, unlike other books on informal logic that I've read, he gives advice on how to answer them.
As a professional who spent 32 years asking questions and making arguments in a courtroom, I wish that I had read this book at the beginning of my career rather than at the end.
Walton does tend to beat a dead horse, however. Although repetition is the surest method of teaching, as a rule of thumb, three repetitions of a point should suffice.
One other minor quibble. He is occasionally guilty of faulty analysis himself. In analyzing the hunter/anti-hunter debate, he said that the hunter's reply about meat eaters being in a poor position to criticize hunting was a weak argument. He found very little parallel between slaughtering innocent wild animals and eating hamburgers. The parallel is this: The objective of hunting is to eat what you kill. (If you're not dedicated to this proposition, stay out of the woods). In order to eat the hamburger, somebody has to slaughter the innocent cow for you. The difference between the hamburger eating anti-hunter and the venison eating hunter is who killed the food and whether they did it for sport or a paycheck.