Originally Posted by
ExplorerWannabe
I like public shaming when dealing with a self-entitled jerk like that. "I'm sorry you unpacked everything and got yourself settled in my seat but an experienced traveler like you must know that people select seats for a reason. I appreciate the fact you like my seat, I chose it for a reason and it's too bad you didn't select it first but don't give me your song-and-dance or try to bully me, just get out of my seat please."
Or what's supposed to the the old Emily Post- "I'm sorry but that doesn't work for me" because traditional manners don't require that one justify or explain their actions in high detail and any explanation on your part gives the other person leverage in trying to change your mind and accept a solution that is not as good for your needs.