I wash one. I realize it’s the one I had popcorn in. I note I should clean that, too, later.

I think your friend had probably learned that if she just notes to clean it later, she will forget and it’ll never happen. I feel like there’s a sense of urgency you learn to develop, that the longer you wait between thinking of a task and completing the task, the more likely it is that the task will simply never get done, so you wind up jumping from task to task as you think of them.