Question

The fallacy that criticizes the source of an opinion, instead of critiquing the reason given for it, is called begging the question.

Answer 1

This is false. The fallacy that criticizes or questions the source is known as the fallacy of the Appeal to Questionable Authority which is a retort that questions or criticizes the source of the information as unreliable. This is a falllacious approach because instead of approaching the actual topic, the source is criticized.

Answer 2

The fallacy that criticizes the source of an opinion, instead of critiquing the reason given for it, is called ad hominem argument. In this fallacy, the proposition is stated to be false because someone who said it is not considered reliable and his opinions are not validated enough to withstand another argument.