https://onlinelibrary.wiley.com/doi/abs/10.1002/icd.2064

https://www.newscientist.com/article/dn13596-male-monkeys-prefer-boys-toys/

https://qz.com/1190996/scientific-research-shows-gender-is-not-just-a-social-construct/

“The size of sex differences in children’s preferences for male-typed and female-typed toys did not appear to be smaller in studies conducted in more egalitarian countries,” says Brenda Todd, a study co-author and senior lecturer in psychology at City University London. Countries rating extremely low on the Gender Inequality Index, such as Sweden, showed similar differences in toy preferences to countries with far greater gender inequality, such as Hungary and the United States.

This runs counter to the popular narrative that gender differences expressed in childhood play are determined entirely by social expectations. Social factors certainly do have influence, and the paper found evidence of this: For example, as boys got older they were increasingly likely to play with conventionally male toys, reflecting the impact of environmental rather than biological causes. But overall, the data reflect broader findings in psychology, which show that biology and society interact to cause gendered behavior. In other words, contrary to the popular progressive belief, gender is partly socially constructed—but it’s not just a social construct.

Despite this empirical truth, researchers who study the biological basis of gender often face political pushback. “Many people are uncomfortable with the idea that gender is not purely a social construct,” says Todd, who notes that her work has faced “very critical attention.” There’s a political preference—especially on the left—Todd believes, for gender to be only a reflection of social factors and so entirely malleable.

Back to the basics because, contrary to biologists, there are a few people here who actually believe gender is a social construct. Let's first review what a "social construct" means:

https://www.merriam-webster.com/dictionary/social%20construct

an idea that has been created and accepted by the people in a society

For gender to be a "social construct" it has to be created by society. Gender is not created by society. Gender is highly influenced by society, but to say gender is created by society is entirely incorrect. Something that is created by biology, if only partially, is not created by society.

CMV