I guess they can be slobs but that's no place for left overs. Trash or fridge is what I thought was the common actions. Leaving left overs out promotes bacteria and leaving food that should be trashed out promotes bugs and rodents. It would also be hard to clean up after it gets really dried and stuck on the dishes so normally you scrape the food off into the trash before putting it in the sink.

Besides that the agent makes it sound like the plates are full and they died during dinner despite the time. If you walked in and saw food on plates by a sink you would not say dinner. You would say dinner if it looks like they were sitting around a table eating a meal. While dinner can refer to food it normally refers to the time you eat the meal (after lunch but before bed) as in dinner time. You would not say food time.