Relativist fallacy

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The relativist fallacy, also known as the subjectivist fallacy, is a fallacy committed, roughly speaking, when one person claims that something may be true for one person but not true for someone else. The fallacy is supposed to rest on the law of non-contradiction. The fallacy, it is said, applies only to objective facts, or what are alleged to be objective facts, rather than to facts about personal tastes or subjective experiences, and only to facts regarded in the same sense and at the same time. On this formulation, the very name "relativist fallacy" begs the question against anyone who earnestly (however mistakenly or not) holds that there are no "objective facts." So some more work has to be done, in a non-question-begging way, to make it clear wherein, exactly, the fallacy lies.

There are at least two ways to interpret "the relativist fallacy": either as identical to relativism (generally), or as the ad hoc adoption of a relativist stance purely to defend a controversial position.

On the one hand, those discussions of the relativist fallacy which make the fallacy out to be identical to relativism (e.g., linguistic relativism or cultural relativism) are themselves committing a commonly-identified fallacy of informal logic, namely, begging the question against an earnest, intelligent, logically-competent relativist. It is itself a fallacy to describe a controversial view as a "fallacy"—not, at least, without arguing that it is a fallacy. In any event, it will not do to argue as follows:

This is an example of circular reasoning.

On the other hand, if someone adopts a simple relativist stance as an ad hoc defense of a controversial or otherwise compromised position—saying, in effect, that "what is true for you is not necessarily true for me," and thereby attempting to avoid having to mount any further defense of the position—one might be said to have committed a fallacy. The accusation of having committed a fallacy might rest on either of two grounds: (1) the relativism on which the bogus defense rests is so simple and meritless that it straightforwardly contradicts the Law of Non-Contradiction; or (2) the defense (and thus the fallacy itself) is an example of ad hoc reasoning. It puts one in the position of asserting or implying that truth or standards of logical consistency are relative to a particular thinker or group and that under some other standard, the position is correct despite its failure to stand up to logic.

On any interpretation of the fallacy, in determining whether the relativist fallacy has been committed, one should distinguish between things which are true for a particular person, and things which are true about that person. Take, for example, the statement proffered by Jim, "More Americans than ever are overweight." One may introduce arguments for and against this proposition, based upon such things as standards of statistical analysis, the definition of "overweight," etc. It is a position which answers to objective logical debate. If Joe answers Jim, saying "That may be true for you, but it is not true for me," he has given an answer which is fallacious as well as being somewhat meaningless in the context of Jim's original statement.

Conversely, take the new statement by Jim, who is 5 feet 6 inches (1.68 m) tall, "270 pounds (120 kg) is grossly overweight." Joe, who is 6 feet 6 inches (1.98 m), and weighs an exact, well-conditioned 270 pounds (120 kg), replies, "That may be true for you, but it is not true for me." In this context, Joe's reply is both meaningful and arguably accurate. As he is discussing something which is true about himself, he is not barred from making an argument which considers subjective facts, and so he does not commit the fallacy.

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