TimS comments on Dunbar's Function - Less Wrong
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The fat people I know don't appear to give a damn about “the standards of our society”. My morbidly obese grandmother (BMI around 40) does think “why bother? It's easier to just eat whatever I want and never exercise”, but she also thinks the same about lots of other things (e.g. she smokes over a pack of cigarettes a day, it's hard to convince her to wear a cast when she breaks a bone, etc. -- she appears to be just waiting to die), and my parents and my sister (BMIs all around 30) say “I'm not that fat -- look at grandma for instance” (and they also insist that I (BMI around 25) am absurdly skinny).
I am confused by this exchange. When we talk about cognitive bias, we accept data that contradicts self-reports all the time. So there is substantial evidence that self-reports about mental processes are unreliable. But when the topic shifts to social norms, self-reports are considered reliable again? I notice I am confused.