If there is an open seat why be a jerk about it. I had to j/s the other day and was given a seat assignment in the back but still always check in with the CA and FO to ask for the ride. Watching this CA not even introduce himself or his FO after I did was the first sign of his attitude. He wanted to see all of my licenses, medical and crew badge to which he gave everyone a solid inspection. Why all this to sit in the back?

After the inspection he handed me everything and said "I'll let you ride." So I smiled and walked by the many empty first class seats and sat in my assigned seat of 27B (oh yes a middle.)

Point is why must we go out of our ways at time to make a commuter feel like a pain in our side. If you are not riding the jump and you need to get home, welcome aboard and take a seat.