"The books reflect a patriarchal society based on the Middle Ages", Martin told the site. "The Middle Ages were not a time of sexual egalitarianism...and they had strong ideas about the roles of women. One of the charges against Joan of Arc that got her burned at the stake was that she wore men’s clothing—that was not a small thing. There were, of course, some strong and competent women. It still doesn’t change the nature of the society. And if you look at the books, my heroes and viewpoint characters are all misfits. They’re outliers. They don’t fit the roles society has for them. They’re ‘cripples, bastards, and broken things‘—a dwarf, a fat guy who can’t fight, a bastard, and women who don’t fit comfortably into the roles society has for them (though there are also those who do—like Sansa and Catelyn)."
A common counter-argument is that Martin is writing fantasy. If his books can include fantastical elements such as dragons and white walkers, doesn't the 'it's all based in history' argument fall short?
“Just because you put in dragons doesn’t mean you can put in anything you want", said Martin. "If pigs could fly, then that’s your book. But that doesn’t mean you also want people walking on their hands instead of their feet. If you’re going to do [a fantasy element], it’s best to only do one of them, or a few. I wanted my books to be strongly grounded in history and to show what medieval society was like, and I was also reacting to a lot of fantasy fiction. Most stories depict what I call the ‘Disneyland Middle Ages’—there are princes and princesses and knights in shining armor, but they didn’t want to show what those societies meant and how they functioned."