Interesting discussion here about men as default.
debuk.wordpress.com/2016/04/16/default-male/
Apart from wondering whether the Green Party tweet about non-men is an April Fools, men-as-default is something I've had to make an effort with when talking to my DD. I've noticed that unless the toy/picture in a book is specifically a girl, I'll call it 'Mr Octopus' or say 'What is the doggy doing? He's eating a bone'.