dirty dishes

I cannot stand to have dirty dishes in the sink. Just can't stand it. (No, I don't have a dish washer.) This means I generally wash dishes three or four times a day. (Sometimes more, if I've been baking or something; sometimes less, if we go out to eat.)

Anyway, the thing I don't understand, is why I do not carry this obsession over into the drying stage. It simply does not bother me in the slightest to leave the clean dishes stand in the dish rack to dry on their own. I generally don't put them away until it's time to cook again.

Why is my "anal retentiveness" so selective?