This was a follow up to the original transgression, you have to be clear of what you are shutting down, before you shut it down. Again the two statements I said are much clearer and don't single out the recipient.
It does not single them out in opposition to the group. Say "we don't do that here" puts the transgressor on one side and the "we" on the other side. Saying "when you do" is not putting the transgressor on a side, but rather placing the onus on them.
My statements don't put the transgressor in opposition to the group, is what I should have said. But I think that thats actually the intention of this author and I don't agree with it.