It's called the benefit of the doubt. You're free to believe one person is telling the truth and one person is lying, or that both people are telling what they believe happened, or whatever, but making that decision before getting both/all sides of a story is not the best way to get the facts.

Just like someone shouldn't read this woman's story and say that everyone above her at Apple should be fired, you also shouldn't read it and say that she's obviously just too sensitive or lying.