My friend’s son was four and had to have it explicitly explained to him that men can be scientists, too! Based on all the books he’d been read and other media, he assumed only women were scientists.
My son wants to be female because every super hero that's interesting to him, it's female (he is 4).
We learned to coast with this, but I did complain about the lack of cool male characters for young kids: the female ones seems to be better curated and more abundant