...because of scarcity of U/G's given on AC allot of times when me and the missus go somewhere far away and we are both flying on rev tix...one of us will sit up front on the way there...the other up front on the way back...and if we want to chat whoever is up front always comes to the rear of the cabin.
I agree with others, 5 minutes and as long as your weren't talking loud wouldn't bother me if I was in J, but I can see how long visits may put some people who have paid for the privlegde off.