He made a mistake, and we corrected it. We didn't realize that we simply do not see that they are private groups (it really doesn't say it for us) and changed our own responses so that we will not post in groups of which we are not a member unless we have to as mods...
I'm sorry, and I do realize what it must have felt like. So does he, although he is a bit less diplomatic in the way he says it.
Seriously, it wouldn't happen again, not without some response.
thanks Damo, really.