They don't explain the absence of... anti-complaining. As in: "girls, I seriously don't know what is your problem; I am a woman, and LW is the most friendly website ever". Did you ever see anything like this on LW?

Um, yes. The very first comment I saw here was exactly that. There are even more comments saying "girls, I see your problem; I am a male, but I too have experienced X" which fits the gender imbalance here.