I'm grossed out by public bathrooms. I try my best not to use one and trained myself to pretty much go all day without using the potty even if I had a zillion things to drink.
What's worse than a public bathroom? Porta potties! Those are the most gross things ever invented. I know they are useful for people who really need to go and are trapped out in the middle or no where... but...eww! I've been in one once when I was a little kid... never again! They smell and are disgusting. I'll just wait until I get home.