I’m a middle-school teacher, which may account for it: we cannot “fire” students. And in the end, those whom we gave a second chance often made us glad we did. If you fire someone who makes a stupid mistake, and you never see them again, you might not ever find out that you used a shotgun when a fly-swatter would have done the trick.
I don’t think you read or comprehended what I wrote to you. You are good at working with middle school children and I am glad you are there. I am not kidding. You are a good person and think right from your universe. Like my sister. She does special education.
However, employers in business working with adults who provide service to customers would think differently about “misbehavior” like this. For a middle school child, you just teach them the way they are supposed to be. At adulthood, you expect a certain level of maturity and trust so they don’t chase away the customers. That’s the way it is.