First, he sat in the wrong place. It could happen to anyone, but it causes confusion among the other passengers and slows the boarding process. It is inconsiderate.
Then, he placed his briefcase in the overhead compartment. You know, when the airline is green-tagging people and passengers are climbing over each other to find an empty space. But, you say, maybe he was tall? Maybe he really needed the legroom? He wasn't that tall. And we were sitting in the exit row.
Then. He took off his shoes.
He bogarted the armrest.
Glad it was a short flight.