@Atom Blitzer,
Hi there.
I think the bit you're missing is that at some point (sometimes age-related, not always) people don't filter - in real-life or online.
There is a group of posters here that has known each other for well over a decade. Weren't young when we met online, are even <cough hack> older now.
I think there is power in knowing each other and still feeling free to express our jerkiest opinions.
Meeting people who already know your jerky side - and still want to meet you - is very cool.