On Character

 There is often a tendency to treat people as though they have one defined set of traits. In reality, people are often a collection of many disparate traits, and exhibit different traits depending on their circumstances. Someone who is nice while conversing to you could very well be rude and abrasive to their children, or furious when provoked or disagreed with. Someone who makes a show of being extremely open minded can in fact be quite narrow minded when introduced to ideas they personally disagree with.

The best way to judge character, thus, is not to pass judgement based on how you perceive them, but to attempt to understand their point of view and see how they react based on circumstance. Approaching them directly can also work, provided you don't provoke their hostility and present an open minded stance. Of course, this is not to say that all behavior should be tolerated or bad behavior shouldn't be punished, but it should be accompanied with a genuine attempt to understand the person behind it, rather than simply dismissing them out of arrogance or assumption.