I am often ready with a glib answer to a problem, but here I am really at a loss.You get a nice group of people, and somebody becomes confrontational, about something which is not remotely confrontational to everybody else in the group. What do you do, without coming down to their level?
   And the other side of the coin, how do you react to the arrivals of the well-meant(??) "praise songs". You cant just say"bugger off they're crap".
   Sorry, this is not a helpful post, I'm just restating the problem. All problems must have solutions, but I cant see a glimmer of light.