You dont have to act like an jerk, but there is no rule sayng you have to be nice, so you can act like a idiot all you want. Getting flamed,bashed,just flame then back back, but they usualy have friends, an example would be like this,
ForumPunk: Guy is gay.
Guy: i am not.
(friend joins in)
friend: haha he is gay
ForumPunk: your right friend
Guy: both of you are handicaps
(another jerk joins in)
Jerk: omgz why did you call my friend a total handicap, you needs a life
(thus this will go on and on)