On the other hand, maybe some people are over-reacting to such germs. Germs are inevitable, they are a part of our environment. Nature understands this. That is why all animals have digestive systems that rid their bodies of waste at regular intervals. Otherwise, we'd be overwhelmed by all kinds of non-beneficial germs, microbes and parasites. A healthy diet and exercise goes a long way to keeping things in check, and preventing unwanted germs from taking hold.
These people with poor bathroom habits don't seem to be any less healthy than the average. Still, it's always a good idea to wash your hands properly each time.