My opinion is this/these assholes are just targeting PB because he's a good poster and so an obvious target...just try and piss people like that off to upset a great site - no doubt because he/she/it possibly has their own site covering OC.
I'm sure some are just young guys with their first hard on as well though, like BF says, just totally ignore shit stupid posts and they go away.
It would be good if there was an invitation only type idea but I'm sure the mods have their reasons for the way things are