So long story short , i have a rabid feminist friend who lives close by and she keeps bring up the "fact" that human's default sex is female and males are some sort of mutant. I tried to ignore her and she keeps bringing it up, so i need an evidence of this not being true. If this is true well then so be it.

I don't think it's true and so if is there a well-known scientist that proves this is incorrect or someone with a well-educated opinion on this topic will be helpful.

I researched a bit on this topic and seems that majority of people believes that humans default sex is female.