A sign? Do they have an option for people who don't wear them, like offering them a mask?
And if he was so late, why didn't they take him right in?
I get the impression your dentist is one of those people who rarely if ever confronts people.
It's a half-way response. Maybe by the time you need to go in again things will have changed.
It may seem baffling that business owners and employees are being such wimps, given that they're at the greatest risk of catching the virus from repeat and sustained exposure to people with silent infections, and they're the ones who need to have conversations (long conversations in enclosed spaces are one thing that greatly increases risk) with people who are potentially infectious. But in another way it makes sense. People in general tend to avoid conflict and none of us are really trained to enforce unpopular policies, especially when doing so risks a violent confrontation. I suspect most of the non mask wearers aren't going to shoot, spit on, or hit someone who turns them away, but enough have that it's a pretty scary thing to countenance. And even a loud, screaming tirade greatly increases potential virus exposure.
One way I'm annoyed with my own state's (California) governor and government is that they've recommended that people wear masks in places of business and in public spaces where people congregate, but they haven't passes a law. This means the onus is on individual business owners, or the employees of said business, to enforce any mask policy they may or may not adopt. Given how over the top some folks are getting when asked to wear masks, it's no wonder individual businesses are not implementing and enforcing mask requirements for customers. If the state policy had teeth, such as the threat hefty fines and of public health officials closing the business down during the crisis, more managers would take it seriously.
We really can't expect hourly employees, or even mild-mannered dentists, to consistently enforce an in-house policy about masks, not when doing so places the employee or proprietor at risk. It's easy to see how one can rationalize that it's "safer" to get Mister-No-Mask in and out of the place as quickly as possible without having to get too close to him. What if you stand up to him and he unleashes a long, virus-laden tirade?
As we re-open, mask wearing in public will be more important than ever, but the protective effect is diluted by people who shrug off the requirement, or wear their masks improperly. More states need to make the mask requirement a legal condition of re-opening, one that can be reported and enforce via fines and forced closures of non-compliant businesses. Then the employees can say, "Sorry, dude, but if we don't enforce this, we will be shut down." This tack won't end all angry confrontations, because there are some people who are really far around the bend, but it may work with folks who aren't wearing masks because they're uncomfortable, or because they are convinced they personally can't be sick or that they don't really do any good.
I see a lot of signs of "Covid-19 fatigue" in our state (which closed down pretty early during the crisis). In the absence of alarming news footage of overfull ERs (averted, for now, by the fairly strict closure terms), many are starting to assume the worst is over, or maybe even that it wasn't such a big deal to begin with. I don't see any way a new wave can be averted, and it will be very hard for governors to roll back to an earlier level of closure.
The question remains what percentage of people will continue to shelter in place for the most part, and what percentage will rush out to dine-in restaurants, hair and nail salons, book stores and in-person church services? And how many people will be forced to return to work now that things are re-opening, even if they'd rather stay home? And what percentage of businesses and places of worship will actually observe and enforce the guidelines? And what will the state and community officials do to those who flaunt the conditions of re-opening?