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Sorry, mothers, boys are not born liking cars. Otherwise, imagine all those little boys 200 or more years ago, liking them but not knowing what they like, a shapeless yearning... Nope, liking cars is not inborn and I will say this even if the first word of my boy happened to be 'auto'.
I've lately heard many feminist mothers (and some others too) complain (or just explain) how they worked hard on gender neutrality in toys and were thwarted in their efforts by their boy who wants cars. Or girl who wants to wear pink although the color isn't even present in their house. I still say liking cars isn't inborn!
If something is inborn about liking gender-specific toys (which I'm not certain about) it's the fascination of a certain gender role. Many boys might be excited in things that are culturally perceived as masculine (probably they don't explain it in these words to their parents, though). Not all, of course. And many girls might find overly feminine things attractive. What they see as masculine or feminine has to change, though, else boys would still just like horses and NOBODY would like cars.
And here comes the other part: if a child is attracted to things that are culturally perceived as masculine or feminine, and their parents were very vigilant in trying to raise their kids gender neutrally, what's the explanation? I think it's that there's no way you can raise your child actually gender neutrally. They don't grow in a vacuum - if you can be completely gender neutral (which I don't think is possible at all, but that's a whole different tweet) the rest of the world isn't.
I won't even try. But I think I'll go for trains in stead of cars, much more ecological. And animals, and dolls too if he wants them, and I think he'd be excited about a little kitchen. But I'll try not to complain if he only wants to play with his toy tigers and scorns the pots and pans.