I have been shocked by some of the things I've seen in channels lately - it most certainly would be considered cyber-bullying. I have been neither a victim nor an aggressor, but quickly lose respect for the people that are being aggressive and nasty.
Suicide is one of the leading causes of death in most industrialized nations. It's real - it happens - and you can be partially responsible if you participate in cyber-bullying.
The group leader was absolutely right to stop the taunting.