One thing I learned quite some time ago, If you come to a public message board and post opinions, those opinions are subject to scrutiny, perhaps even ridicule. So when a person reacts to scrutiny in a poor manner and starts lashing out at people, or threatening a dramatic "goodbye" never to return again, it really reflects poorly on that person, even if the person who initially leveled criticism was out of line.
I always try to be reasonable when my opinions are criticized, for instance, once I saw a guy posting pics of his kid eating tons of Doritos and McDonald's on his blog and I made the mistake of commenting on how unhealthy I though that was... To make a long story short, the guy turned apoplectic and angrily told me not to tell him, "how to raise his kid." I thought he was overreacting, but I soon learned that just about everyone thought I was out of line and shouldn't have interfered. After suffering what seemed like universal condemnation, the correct thing to do was issue an apology and move on... not dig in, so that's exactly what I did.
When some people are scrutinized they dig in and become bitterly angry. Watching someone lash out in anger at everyone at a public message board when they don't get their way, fail to get their point across, or suffer the indignity of being wrong is really not amusing as I once thought.