Ignoring an unexpected phone call is one thing, but you should never ignore a person knocking on your door. I’m afraid it sounds like you are exactly the sort of person that everyone else in this thread is complaining about and laughing about.
Why? For women, it can be a dangerous situation. I'm pretty comfortable since I'm a mountain of a man compared to the women who live in my house, but it's pretty dumb to say that everyone should answer the door.