Okay, this letter is ridiculous. He isn’t criticizing the data- he’s completely ignoring it. What he’s in essence saying is, there is no way to really run this survey because we can’t ever trust the people being surveyed, so instead please trust and accept my forty-five-year-old remembrances about college coeds’ white teeth which only apply to about 10% of the population surveyed. Because I am more worth trusting.
Judging people favorably would really be an admirable thing for him to do in this scenario. He’s just being incredibly dismissive, especially in many of his responses to reader comments.