Maybe by 'true gamer' they mean someone whose identity is defined by gaming? Not for me to say whether or not that's healthy, but it's certainly extreme. And then going further to link this identity to gender is just weird. I mean, who cares? We're all just text on the internet to each other, what difference does gender or sexuality or race etc make to gaming? Unless it's a game that explores those themes, it shouldn't, but here we are.