When I got there and said I was healthy and I didn't need a mask, they told me I had to wait outside. So I left. And when they called me to say they were ready I went off and called them out for discrimination. Fuck them.
Update: I filed a complaint with their national website, received a call a little while ago about it, and got nowhere with the person on the other end of the line. At least I got another chance to bitch about how stupid it is that I was being discriminated against for being healthy.
Unless they've got an airlock between the rooms and the rest of the building, and they purge the entire environment between patients, those masks wouldn't do shit even if they did shit in the first place.