I had 2 DDs, then B/G twins and the amount of comments I get about their personalities being to do with their sex makes me really, really angry.
DD1 is the girliest girl you could ever meet, despite us being as careful as possibly to be neutral when she was a baby. She is also incredibly sociable and a very talented artist (takes after her dad), but also good at maths like me.
DD2 was raised surrounded by DD1s pink sparkly glitter unicorn obsession but is so far the other end of the scale that strangers often think she is a boy, even when wearing girly hand-me-downs from DD1. She is very physical, enjoys playing the 'baddy', loves a good monster, won't wear dresses, though she is also very good at drawing like DD1 and DH (which others often perceive as 'girly')
The twins are only little, but DD3 is very sociable and smiles and chatters to anyone and everyone. She is also very physical and learnt to crawl at 5 months. She is starting to pull up now and is 6 months in a week or so. DS is sensitive and quiet. He is also quite physically capable but not a patch on DD3. He needs lots more cuddles and reassurance than she does, and he generally a bit of a grump. This is exactly what DD2 was like until she was able to crawl, and she became increasingly verbose when she learnt to walk and talk. I suspect DS will be the same because he was an incredibly whiny baby until he learnt to sit, and has become increasingly less so as he hits milestones.
And yet, everyone who meets them attributes the twins' dispositions to the result of their sex, not the fact they're separate humans. DD2's needs for physical challenges and a robust style of play gets dismissed as her having 'lots of energy today'... DD1 gets no end of components for how kind or thoughtful she is, when she is no more thoughtful or kind than DD1, she's just a stereotypical girl.
It makes me really cross to think that at 6, 3, and 6 months, my children are being expected to perform to such rigid gender roles. They're kids. Let them be kids! There really is less difference between sexes than within them and I find it terribly sad that we reduce our children's experiences of the world so much by doing this to them from the minute they're born.