I think that people enjoy listening to short, straightforward stories, without a long preface going into every single gory detail before actually reaching the main part of the story.

Zuckerberg isn't in a court of law, so I'm guessing he's skipping details and bending the truth (or lying) to make his story simpler and easier to understand. He's also probably glossing over things to make his story sound more dramatic and impressive.

Sorry to hear about your history with him though. That sucks. =T