Here's the difference dumbass. When patrons come into a grocery store they are masked up, they move around and don't stay in one place for more than 2-3 minutes, and certainly not directly in front of a grocery store worker. So even if they are covid positive, the likelihood they will transmit to someone else is low. In a classroom, you'll have 30 students confined in a classroom for 50 minutes, probably all facing in one direction. And this will happen 6 times a day, 5 days a week.
Here, re-read this article to freshen up.
https://www.erinbromage.com/post/the-risks-know-them-avoid-them
And remember, the most important thing teachers want is testing!
https://www.msn.com/en-us/news/us/l...o-reopening-schools/ar-BB178hPd?ocid=msedgdhp
Your sense of smell is faulty, maybe you have covid!