I think it's one of the minor conversational issues that show up other people's entrenched gender stereotypes. Or stupidity. Or their inability to realise that not everyone shares their preferences.
I actually agree that in this country at the moment there seems to be a quite strong current feeling that girls are 'better', that every woman really wants a girl first, whatever she says, and then a boy 'for her husband', but that if she could only have a child or children of one sex, then girls all the way.
And I don't think it's any kind of feminist backlash against boys being the desired sex for years, I think it's a fairly depressing response to increasingly gendered marketing of children's clothes and toys, which is forming our opinion of boys and girls being increasingly polarised and different.
I thought I had zero sex preference when I was pregnant with what I knew would be my only child. Not long before the 20 week scan, I was in a shopping centre with a friend and her monosyllabic teenage son, and found myself getting suddenly panicky at the idea of not wanting a boy, and realising it was because of the racks of lovely, brightly-coloured girls clothes, compared to a single aisle of trousers and jumpers in blue, navy, khaki and bottle-green, decorated with cars or dinosaurs I realise I was unconsciously accepting a dopey stereotype. Girls = fun! free! emotional! Can do anything! however traditionally girlish or boyish! Boys = limited emotional range! macho! gruff! alien etc etc. (Not helped by monosyllabic teenager...)
I was terribly upset when I found out I was carrying a boy at the scan. I realised I was being stupid and self-indulgent, and never said a word to another soul. I was besotted with him from birth. He is one now. He has no idea he is a 'boy', or how boys are supposed to behave. He plays with kitchens and fire engines, toy cars and baby dolls and balls. He loves baking and dancing. His favourite colour is pink. His favourite book is The Pointy Hatted Princesses. He obeys no gender stereotypes whatsoever.
He is unspeakably gorgeous. I do dread the gender indoctrination he will inevitably be subject to as he gets older, though.