Well this place has it's moments, but on the whole it's very well moderated right now.
I found a 13 page thread on a forum yesterday, which consisted of a guy promoting a product, & people bagging him. The thread was eventually locked, but 13 pages??? Good grief.....
The majority of disagreement seems to be through people being unable to accept criticism- insecurity as delia says.
When you believe in yourself, you can welcome criticism- you know it's probably unfounded, but it never hurts to listen!