Contamination fears are just one minor aspect of a much larger issue.
ANyway, this lady's OCD has nothing to do with the topic at hand. Where I work the Medical staff have posted guidleines for proper bathroom behaviour to reduce the risk of passing germs onto others . Turn the tap on with a paper towel, wash your hands, dry your hands and THEN turn off the water with the same paper towel. That procedure gives credence to the fact there are germs in the bathroom. I don't think it's unreasonable to want to avoid other people's germs. I mean geeze, think about some of the things a woman has to do in a bathroom during certain times of the month. They then use their hands to open the lock on the door, turn on the tap, etc. That's why alot of bathrooms have gone to automatic water, soap and no doors. To reduce both water consumption AND germs.
ANd just because urine is sterile (and it's not always if said person has bacteria in it....something I had throughout my last pregnancy), doesn't mean I want to have someone else's on on me. It also ceases to be unsterile as soon as it hits the fllor where others have walked.
AM I obsessed with cleanliness? No, but I have my own standards in public bathrooms and you'll never convince me I'm going overboard.