Lego used to be gender less... You could swap heads, bodies etc and that for me was most of the fun - the kits had small enough parts that you could build it up to whatever you wanted.gender just wasn't an issue.
At some point it got pinkified, the bits got larger and the imaginative play bit got diminished. Now it's more 'set' so that you can't build much other than a plane with that kit. The older kits you could do anything with.
And for those that say it's not an issue, I actually disagree. I clearly remember several instances in my childhood where I was told off for playing with boys toys (not by my parents thank god.) one I really remember is being very upset indeed when I was told off for playing with some meccano in a dentists waiting room, and told that NICE little girls played with dolls. That's so upsetting for a child. You're sat there , all quiet and on your best behaviour, playing in the corner thinking 'hmm... This looks fun, I'll just sit here and tinker with this" then some old bag slaps your wrist and implies you're not a nice child.... Grim.
The attitude continues through childhood and into adulthood. Nice girls don't do science, it's hard. Nice girls play with dolls. Nice girls don't play in the mud. Nice girls don't get messy with chemistry sets. Nice girls submit to their men... If you were nicer, or thinner, or just didn't nag, he wouldn't hit you.
Do you see how those attitudes colour EVERYTHING?
I'm not saying that Lego friends is a direct shackle of the patriarchy, my friends, I'm just saying that a big parts of the 'nice girls don't.....' Theme starts with how we stop kids playing with things because of our ideas on gender.