You've got it all wrong. We need the Kindergarden Zone!
A special sub-serverlist, servers that don't allow chatting, they are limited to a specific subset of maps, and nobody can have a name other than "newbie1", "newbie2", etc.
Letting children play online games is a bad idea to begin with. If you are easily offended, you shouldn't play online games, because people will say/do whatever they want.
You should especially not play online games if they promote custom content, because you're going to see something that offends you or something that removes the wholesomeness from your child's mind at some point.
This doesn't mean that swearing and humping sticks is necessarily good, but it does mean that you should reconsider your continued use of the Internet.
Also, you need to complain to server owners, if anybody. You could also get together and rent a server from Jitspoe, called "The morally right server", which would be quite the morally correct place to play. You could just keep heathens banned and run maps fit for Jesus himself!