Going back to the original post.
The longer a forum is established, the larger the selection of users it can sample from who is out there. So during this time you are going to get all the usual, men pretending to be woman, woman pretending to be men, pedophiles, stalkers, every flavor of sexual preference, religion and race, stone cold killers to saints. All with different upbringings and core beliefs.
So you would wonder how can people this different get along at all? Well they can't really, it's only tolerance from others that allows an individual to be accepted. Try pushing an alternate personal agenda too hard and you will soon find yourself an outcast.
The only exception to this is what moderators allow or tolerate, it's their job to keep peace and settle disputes (at their leisure). If users are allowed to get away with bullying or harassment for no reason they will lose users who don't want to be a part of it.