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jimmy comments on Talking Snakes: A Cautionary Tale - Less Wrong
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Not necessarily. The vast majority of propositions are false. Most of them are obviously false; we don't need to spend much mental energy to reject the hypothesis that "Barack Obama is a wooly mammoth," or "the moon is made of butternut squash." "Absurd" is a useful label for statements that we can reject with minimal mental effort. And it makes sense that we refuse to consider most such statements; our mental time and energy is very limited, and if we want to live productive lives, we have to focus on things that have some decent probability of being true.
The problem is not denominating certain things as absurd, it is rejecting claims that we have reason to take more seriously. Both evolution and Christianity are believed by large enough communities that we should not reject either claim as "absurd." Rather, when many people believe something, we should attend to the best arguments in favor of those beliefs before we decide whether we disagree.
But you don't reject the hypothesis that "Barack Obama is a wooly mammoth" because it's absurd - nobody has seriously presented it. If someone had a reason to seriously present it, then I'd not dismiss it out of hand - if only because I was interested enough to hear it in the first place, so would want to see if the speaker was making a clever joke, or perhaps needed immediate medical care. As EY might say, noticing a hypothesis is unlikely enough in the first place that you should probably pay some attention to it, if the speaker was one of the people you listen to. cf. Einstein's Arrogance
"If someone had a reason to seriously present it, then I'd not dismiss it out of hand"
It's important to not that no one has. You can't update on fictitious evidence.
In the (unlikely) case that something unprobable ends up with strong evidence backing it, then it becomes probable whether or not it was called "absurd". Until then, we dismiss it because it's absurd.
I think that absurdity, in this sense, is just an example of Occam's Razor / Bayesian rationalty in practice. If something has a low prior, and we've no evidence that would make us raise our probability estimates, then we should believe that the idea probably isn't true.
I've always assumed that the absurdity bias was a tendency to do something slightly different. In this context, absurdity is a measure of how closely an idea conforms to our usual experiences. It's a measure of how plausible an idea feels to our gut. By this definition, absurdity is being used as a proxy for "low probability estimate, rationally assigned".
It's often a good proxy, but not always.
Or perhaps another way to put it: when evidence seems to point to an extremely unlikely conclusion, we tend to doubt the accuracy of the evidence. And the absurdity bias is a tendency to doubt the evidence more thoroughly than ideal rationality would demand.
(Admission: I've noticed that I've had some trouble defining the bias, and now I'm considering the possibility that "absurdity bias" is a less useful concept than I thought it was).