To me this story says more about the person who ordered the unclean to wash his hands. Live and let live, and if you can't live with what someone else is doing, change what YOU are doing so that you are not affected. Like don't go there or any number of other options.
I can't figure out why people think they have the power and control to interfere in other people's lives and business by telling them what to do. This isn't even a law the guy is breaking. We're not talking about an adult/child relationship, or an employer/employee relationship, or a wife/husband relationship, we're talking about 2 independent adults who happen to be using the same public bathroom!
The thing that is most confusing is that it seems it's usually the same posters who rant about their freedom, who want to jump on others who aren't doing what they expect them to do, even though they're free to do it.
We already know we can't expect everyone to do the right thing, we can only control ourselves, right? So don't eat from anywhere where the potential unclean might have direct access to your food, because you absolutely don't know where anyone else's hands have been and whether they were washed afterwards.
There are laws and regs in place to protect your food from the venue's food handlers, so order off the menu! If everyone did this the venue would soon discover that if they want to serve a buffet, they'd better invest in a server and not allow any customers to have direct access to everyone else's food.
These people that you might have occasion to see at the buffet scratching their arses, picking their noses, or not washing their hands after visiting the restroom are only the ones you might happen to 'see'. There are many more that you haven't seen, doing all kinds of stuff, who have also had the opportunity to touch your buffet food. They might not have been doing whatever they were doing while they were at the buffet, and they might have even looked 'normal' and clean!