We already hold discussions of politics to a higher standard - I see the reproof 'politics is the mind-killer' relatively often. And this without any particular post arguing that we're so hideously biased about politics that we need to hold ourselves to a much higher standard than on just about any other topic. And given that the long and very well-documented history of sexism and discrimination against women suggests that enormous masses can be completely wrong for long periods of time (both us and the ancients can't be right about women), we already have arguments that we specifically are massively biased about gender issues and should hold ourselves to unusually high standards.

Or, if the relevant comments Alicorn cited were about blacks, I don't think anyone here would even question the need for a higher standard. We all understand intuitively the appeal of racism, its long, hateful, and entrenched history, and that if we're going to make arguments like blacks are stupider, we'd better have damn good evidence - and merely anecdotal evidence like we see in the cited comments, which boil down to 'in my experience' and 'according to my armchair theorizing', will cut absolutely no mustard.