This sounds outrageous, but one should remain skeptical. Most people, in retrospect, will describe themselves as being "polite" or "calm." "No, I didn't raise my voice at all!" But these sorts of self-reports are prone to all sorts of subjectivity or bias, and I wouldn't simply take them at face value. My "calm and reasoned" could be another's "aggressive and threatening."

Not saying that the stories are necessarily inaccurate, rather, how can we really know for sure without some sort of independent confirmation? I file these under "troubling anecdotes in need of more data."