Every psychological difference is ultimately biological, but this fact is not as interesting as you may think.
It's kind of strange that perfectly obvious things like this need to be pointed out. Even for a non-reductionist about mind/psychology this all is trivially true. People must have very strange ideas about how psychology and physiology relate.
Overlooks the fact that newborns haven’t been socialised yet , still there are differences in the female and male newborn brains , so at least the differences that exist at birth must be biological .