I feel like that's a bit exaggerated, because an angry person will still remember themselves yelling and maybe throwing things. Once they've called down, they might still be inclined to argue that what they did was correct and justified, but they won't have trouble admitting they did it. If a person doesn't remember having the experience of yelling and throwing things, they won't know anything about their internal state at the time it happened. So people telling them something happened is evidence that it did, but it was the ... conscious experience of someone else? (Blargh, fuzzy wording.)