Potty Talk

There are strange things going on in the restroom at my job. Sounds creepy, right? Well, it is. The firm that I work for shares the floor in our building with a law firm, and an employee at the law firm is a non-hand washer. Gross. And weird. I mean, what adult doesn't wash their hands?
It gets grosser, and weirder. Occasionally, the non-hand washer come into the restroom barefoot. There aren't that many people that use the women's restroom, but still, don't walk into a public restroom barefoot. That is just a foot fungus waiting to happen.
There is a gym in our building that this lady must use because at least once a week, there is a pile of clothes in the handicap stall. She goes in there, changes into her gym clothes, and just leaves her regular clothes on the floor. So that foot fungus caused by her bare feet is slowly spreading to her work clothes.
I just don't understand the non-hand washing. The other things I can overlook, but we are taught from age zero that we always wash our hands. A couple of weeks ago, a girl I work with was in the restroom at the same time as this woman, and the woman actually turned on the water and walked out. No, she didn't wash her hands, she only turned on the water. She didn't even turn the water off. It was almost like she was turning on the water for my coworker, just to make sure she was going to wash her hands.
Can anyone think of any reason to not wash? We even have one of those automatic paper towel dispensers, so it makes it even easier to wash your hands. I cannot think of even one excuse. She is a grown woman, a lawyer, and I will never ever shake her hand.