So.

A time travelling alien in a police box is fine.

But make it a woman and suddenly its not fine?

Think on that.

As a lifelong (and I mean lifelong, been watching since I was a baby, my first real memory is the Regeneration of Pertwee into Baker) fan, I'm fine with this.

The Doctor is the Doctor. Man, woman, small furry creature from alpha centuri... It's the Doctor.

Plus who said he was a man as we know one anyway? Could be Gallifreyan genitals are swapped....