There is an interesting debate on gender being a social construct. It's the typical nature vs nurture discussion. In simple words, many sociologists believe that gender is not something you are born with but something that you learn as you grow. 1/

You adopt male gender stereotypes because society expect them from you. Though sociologists sometimes ignore biological and scientific facts. There is an interesting study of Willian G. Reiner that caught my eye. Sex assignment at birth usually depends on the... 2/

existence of genitalia, in simple words, penis. However, in Reiner's study, many of the born infants had absent or severely inadequate male genitalia despite expecting them to be males due to active prenatal androgen effects. So Renier reared them as females. 3/

Of total 73, 60 were reared females, but only 26 declared female identity, while 32 returned to their male identity as they grew up despite the society expecting them to be females. This study is a scientific indication that gender is not necessarily a social construct. 4/

There is another famous case of David Reimer. He was born a male, but his male genitalia got several injured during unsuccessful circumcision, so he was reassigned as a female. Between the age of 9 and 11, he was very uncomfortable about his female identity, and by 15 he.. 5/

was a male. He suffered severe depression and later committed suicide. So if gender was completely a social construct and not something natural, he would have adopted his female identity. 6/

Sources
1. William G. Reiner's study: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1421518/
2. David Reimer: https://www.latimes.com/archives/la-xpm-2004-may-13-me-reimer13-story.html