We have been hearing that we need to wear a mask and avoid others for the past six months practically on a daily basis. There is a sign on every retail establishment in my city to enter with a mask. If I was in an enclosed space and someone didn't have a mask I wouldn't hesitate to ask them to cover up or leave.
If we had a "national policy" to enforce masks usage is President Biden going deploy federal troops to stand on every street corner to enforce the mask policy ? The way our Federal government works is to let the States enforce these policies.