the idea that characters should be met with failure or success because of the character. its not about positive/negative, and there are cultural (and maybe biological, but the expression of any innately gender influenced* behaviors are absolutely mediated by the culture, so its really difficult to sort out whats what, and from what ive seen theres a lot more socio-cultural stuff and less biology than you would think). song of ice and fire is a good example: the women in that setting fuck up. a lot. they make bad decisions. a lot. its not too terribly sexist. heres why: they fail because of character flaws(not always their own). they never do things 'because theyre women'-there are times when they do things because theyre mothers, daughters, wives, or to deal with an absurdly sexist society, but there are times that the male characters (who fail just as often, and just as severely, if not more so in some cases.) do plenty of things because theyre fathers, sons, husbands, chivalry intoxicated morons, or straight up sexist fuckers. the women of the setting are shown to be just as competent(or not) in every way(ive only read to book four, maybe the women all become incompetent morons and the men MS's), and, when they somehow do get into a position of power, just as varied in ability as their male counterparts. they dont fail significantly more or less (averaging for the genders of characters and the enormity of the mistakes), and when they do, it is on at least a handful occasions (out of the hundreds of fuckups the characters make in the first four books) because the odds are stacked against them just for being women in a wildly sexist society (on top of all the other reasons the odds are stacked against them). theyre just as moral (or not), on average, as the men in the setting. they do things. they have motivations-not all of which are male.
also theyre well written. i cannot fucking stress that part enough.
*i know its essentialist and binary genders are bullshit but im going for accessibility here and ive not slept in far too long so my explanation would be totally incoherent.