At this point I have only been in 1 group play match. It was with DaveBond007. We both told the other when we thought there was a good shot and had a nice conversation during the round. He ended up beating me on the last hole and we had a good time.
There are probably some trash talkers out there, the way to stop that is start a post and call them out...when folks decide to not play rounds with them, they can change their ways or not play with groups. WE should be able to police ourselves.