That is patently false, and you should not make factual claims under these circumstances. These claims add to the noise, not the signal.
The scientific evidence for innate psychological differences between girls and boys is overwhelming. There is a clear scientific consensus on this. I cannot fathom how this can still be controversial.
Specifically about your "cars vs dolls" example, I'll give you two quotations right of the bat:
- Shown two pictures, one of a mobile (physical-mechanical object) and one of a face (social object), there is a clear gender difference how much a child will look at the mobile vs face. (Yes, boy likes mobile, girl likes face.) In newborns btw. so that is hardly an artifact of human societal norms. [1]
- Offered a choice between a toy truck and a doll, there is a clear gender difference how much an adolescent will play with the truck vs doll. (Yes, boy likes truck, girl likes doll.) In monkeys btw, so that is hardly an artifact of human societal norms. [2]
[1] http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.627...
[2] https://www.livescience.com/22677-girls-dolls-boys-toy-truck...
{Ed. spelling}