Re: How would you handle this?
So my first thought was that you handled it fine.
Then I thought some more and figured that the teacher had already given the class their punishment and that the case was closed in her mind. So maybe, I would have just reminded DS that sometimes the entire class gets punished even when some kids aren't misbehaving. Maybe, just let him know that I expect him to only use respectful language and to make sure that he keeps his nose clean, so to speak.
And then keep my eye open for any other news. Perhaps email the teacher and tell her to let you know personally if she has any behavior issues with your child in the future.
I HATED it when the entire class would get punished. HATED it. I was (am?) a goodie two shoes who tried her best to be a rule follower and please the teachers. But I got to the point where I was able to differentiate between my own personal guilt/innocence and having to "take one for the team."
Melissa-Wife, mother to DS 4/02 and DD 4/07, DS 7/08
ISO: my lost shaker of salt