I'm sure a lot of the "know it alls" are also equally annoyed by people who are just silent and don't share their opinions.

We all have different ways of coping with our insecurities; some withdraw, others overcompensate. Some direct their negative feelings inside, others direct their negative feelings at others.

Personally, I prefer to have empathy and try to understand where they're coming from or what they're actually getting at - either extreme. I don't know what their past is, so I'd rather not judge them. Sure, I'll some annoyance at either end... but I just remind myself that it's who they are and it's clearly the only way they know how to express themselves. Both ends take a lot of patience and empathy.