On my flight today, this guy (on the standby list so I am assuming he is likely a non-rev passenger) in the row in front of me played the music on his phone without a headset all the way from the gate. As we took off, he turned the music even louder.
When I asked him to put on a headset, he did not listen. So, I asked an FA to do it. The guy acted as if it was not his fault as UA did not give him a headset. She got him one and that fixed the problem.
Then when I got off the plane, I saw he had totally trashed his seating area - it looked like the floor of Texas Roadhouse
I really doubt this guy is a UA employee (and I hope this guy is not - customer-face or not). This made me wonder... do front line employees have a channel to report nonrevs with bad behavior? Does UA ever tell employees "you've got a bad relative/friend and no more pass for this person"?