What's the Point?

My husband made an accusation the other day, and while I'm not saying that his accusation was very far from the truth, I felt like his example was stupid and caused me to be argumentative.

We were in the kitchen when he pointed out that I have a tendency to not use the last bit of a product. For example, the milk. I can stretch a tablespoon of milk to last through two pots of coffee, but apparently when I put back the milk jug with only teentsy bits of milk in it - this drives him batty. The milk, however, is my example. HIS example was the cheese. He said, "...like you put back the Swiss with only one slice left."
Now while I totally see his point and am very positive that he is right (if he weren't right I wouldn't have 45 bottles of lotion, shampoo and conditioner with an ounce at the bottom of the bottle as I preserve them for no apparent reason) I couldn't help, but be totally agitated by this example. So... if I am making a sandwich and I normally only use one piece of Swiss on my sandwich, I am supposed to use TWO pieces of cheese because having ONE piece of cheese left in the fridge is somehow irritating? Somehow one piece of cheese in the fridge is LESS appealing than not having any cheese left in the fridge? How does that make sense? I have never gone to the fridge looking for cheese to put on a sandwich and gone, "Aw crap! There's only one giant slice of cheese? What am I going to do now?" So I got mad at him, not because he was being critical of me, but because his point was spoiled by his poor example choice.

What does this say about me??