Why is it so hard for people to admit they are even a little vain?

We are all a little vain, if we were not, we would leave the house as if we just crawled from under a rock. Hardly anyone leaves their home with out brushing or combing their hair, making sure their clothes are clean and pressed. Women put on makeup and guys pluck nose hairs. People like things that look nice, themselves, and other people they have to look at. Why is it so hard to admit that? We are all vain to some point, some more than others, can’t we just be honest and admit it? People want to act as if looks mean nothing. I bet you would not have a green dishwasher, a red stove top, stainless steel fridge, Gray counter tops and pink or peach walls in your kitchen, even if functionally it could still cook a three course meal.