2. When you should be eating
Everybody has that friend who seems perfectly well-behaved through the process of ordering food at a restaurant and then waiting for their meal to arrive. But as soon as the food is on the table, they demand that everybody else at the table delay eating so that they can take a picture of the food or, even worse, capture a selfie with everybody’s food in the background. Stop annoying your friends and save the selfie-taking for when you don’t have food that’s getting cold.