The president expects his staff to show up ready. As one senior aide told Politico, "If people aren't prepared, if ideas are half-baked, he gets a little annoyed because he feels like he could be using his time better."
He also dislikes when people monopolize the conversation at meetings, preventing others from speaking, and when people try to micromanage his time. "If you spend too much time telling him where to go, how you get there, and everything in between, it drives him crazy," says an aide.