The whole piece is a little tongue in cheek but amongst the humor there's some serious truth. Like 'The Communal Dining Thief' - that one person who has to try all the food at the table "can I just try a bite of your cheesecake?" or "can I take a sip of that please?" Everyone has one in their group - if it's you - stop it now.
Then there's 'The Substitutor' - the one who always has to change items in a dish. "I'd like the burger but can I have the cheese from the chicken sandwich instead of the bacon and forget the tomato, instead could you put some of the chili from the spicy wings?"
The list goes on and at some point you're bound to find yourself among the different types of people, it seems we all have at least one annoying dining trait.