The one incident that I remember was on (guess) Continental. It must be about five or six years ago. So, I was on the plane and a well dressed lady came down and told me to get out of her seat. To make a long story short, she hadn't read her boarding pass properly and didn't have the window seat. An FA in the aisle sorted it out. So she sat down and lectured me about rude travelers and how people dressed on airplanes (I think I was a target, because I was in jeans); she also let me know that she didn't appreciate my taking her seat, but she was going to get an upgrade as she was platinum. She then explained how elite status worked.

The next thing she did was to engage in what started as polite conversation with the lady across the aisle from her. Within less than a minute, I heard her lecture the woman about the way she was holding her baby and that she might hurt the child’s neck. She also got into a discussion with a guy holding a bag of food, but I missed that exchange because an announcement. She was annoyed when the flight attendant wouldn’t bring here water.

Well, the GA came down the aisle with some upgrades. I admired the woman, because she tried to take mine. When then GA mentioned my name the lady said 'yes' and stood up to move to the front. That issue got satisfactorily resolved. I think she did end up with the window seat, so I hope she was happy. I was glad to get away from her.