Yeah you are right it was poorly worded, and I actually agree with the fact that you don't have to experience everything just to write. But, you have to have some knowledge, and what ever you write, it's always inspired by something other than plain nothingness.
Well, of course you do. I'm not suggesting that a tabula rasa baby could pop out and write a book. Everything starts somewhere, but we use our imaginations to build a bridge from what we know to what we couldn't possibly know.
My first novel involves the child of an angel and a french slattern. That's the main character. I'm neither French, nor angelic, but I am a human who feels pain and suffers, so it's not that hard to imagine what he'd feel like, deprived of his mother, forever barred from his father, unable to die, but unable to be with the rest of the world. I don't know what it's like to be him, but I DO know what it's like to be alone.
In the same novel, the second protagonist is a female Sheriff. I've never been a Sheriff or a female, but again, I've been a human. I know what it's like to be responsible for things, I know what it's like to feel like you're not good enough, and I know what it feels like to not be taken seriously by people.
That's what's needed -- empathy. Empathy is magical. It allows us to place ourselves in the roles of people wildly different than us, only to discover they really aren't that different at all. Fundamentally, everyone wants the same things. And a writer who doesn't understand what those things are has much bigger problems than writing female characters or people of color.
As for experience, writers have the best job in the world, because we can fake it. Don't know how to sail a boat? Go read a book on sailing. Don't know how an Enochian would summon Baphomet? Get a book. Don't know how women feel? There are roughly eight million books discussing how women feel in the modern book store.
I think this is going to be my last post on the subject, because we're treading a little far afield, but if you're a writer who feels uncomfortable writing characters who are different than you, you ought to be actively working on that, because it's an incredible weakness for a writer. Very few writers who lack the sort of empathy needed to write non-them characters ever make it. Even the hackiest of hacks manage to get female characters in their books.
If someone grew up knowing only white men, I'd be happy to make recommendations regarding books they could read to expand their understanding of humanity.