Interesting thought... I consider myself to be reasonably polite – but that's more by chance than by design. Politeness has no intrinsic value for me. Openness, on the other hand, does. When combined with objectivity, it represents the pinnacle of successful communication for me. Those who are not accustomed to this may sometimes perceive me as impolite. And when I encounter incomprehension or ignorance, I sometimes respond – intentionally – in a harsh manner. It is effective.