It goes both ways

A passenger was unhappy with the way an airline crew member had treated him when he had to use the restroom of the first-class section, due to overcrowded restrooms in his own Economy class section and a really urgent stomachache problem. He ran to the first-class section and on the way, the crew member did not say anything. It was only when he had finished using it that the crew member chided him and then stared after him, as he went back to his section.

Indeed, the crew member could have spoken to him more politely and not been so indiscreet towards him. I believe the crew member knew he was not feeling well as he had let the passenger use the restroom. At the same time, the passenger cannot really place the entire blame on the crew member as he had failed to explain his situation to the crew member at all.