this is just catering to the predominantly male audience of early tech adopters. I remember hearing that the landing assistant in soviet fighter jets has a female voice, because it has a soothing effect on the male pilots.
My personal opinion is the "Bitching Betty" voice with its crisp instructions and authoritative tone makes us subliminally think of our mother giving us guidance or reprimand at an early age. It is a great design; it has saved a TON of pilot lives who otherwise would have accidentally perished.