It reminds me of the battles that take place in one of my drawing sites.

You can see the fight in action here (in the room one down and one right from the center, especially the first 30 seconds): https://www.youtube.com/watch?v=qIJ3XFPRsSw (a lot of swastikas and penises so beware)

I'm glad that it's somewhat self-moderating but the vandals usually have the upper hand.