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.
I think one of the most effective ways of fighting this (aside from taking to the street directly) is via finances.
Any business that whines about face diapers or poisons, just leave. Don't pay them a penny. Use Telegram, Gab, Gettr, etc., to find sane alternative services in your area.