Gender bias is not some objective feature of writing; it is determined and defined by our perceptions. Men seem extremely likely to perceive it differently from women (see almost every sexual harassment lawsuit). Alicorn has never been super outspoken on this issue and has never been confrontational about it. As one of the most active female readers of this site, if she perceives a gender bias in many posts/comments here that she believes warrants a top-level post, that seems to me to be very strong evidence that something is wrong. That fact combined with the data she did provide seem to me quite convincing that this issue is at least worth thinking about.

Also, if I understand her correctly, her objection is not to making generalizations without overwhelming hard data, it is to making generalizations without the humility appropriate to generalizations not supported by overwhelmingly hard data. If some little study fits a pre-existing belief about ev-psych and how the genders work, posters shouldn't be super-certain that it's correct simply because it conforms to their pre-existing beliefs. After all, being human, they may well dismiss a similar study showing the exact opposite effect without second thought.