It is what it is, but I'm not big on being the "Mask Police". I haven't had a Channel 4 moment yet, but I'm thinking show up; try to mediate it; ask them to leave; then issue the CTW and drive off. If the business calls back, now you go back; warn one more time; then go custodial. That way, if it does go south, you've done all you could to avoid a confrontation. Not my idea of the best or most efficient use of my time, but I rarely get to make that decision anyway, so...
As someone else posted, it's basically the same as the "No Shirt, No Shoes, No Service" policy that some businesses have. Why do some people have to try to turn it into a David -vs- Goliath showdown? Take your business somewhere else. Rest assured, after you show your ass and (maybe) get arrested, they won't want you back again anyway. It's just ignorant.
Then again, I always said we only catch the stupid ones, so maybe this is where they hone their craft....who knows?