What was the point of the AC comment? Was it to make a point or upset everyone? Think about it... it was most likely a troll, intent to draw your ire and cause upset. Then sit and watch the replies fly in.
What happens when the replies fly in? Successful target, check back and troll often in hopes to succeed again. Its like a two year old checking his boundries. If you simply ignore it... even if it upset you... even if it made you mad.... the person will eventually get bored and move on to another person. Sure, some can be persistant, but they usually go away (check all my past JEs... trust me, I had SEVERAL AC and crapflood trolls that all eventually gave up).
Now, unfortunately, that there have been many JEs about it, the AC views the situation and people affected as a goldmine. You will have to start posting as 'no foe' (or f & fof only). Cause it'll simply go from bad to worse.
Hopefully this JE will teach you guys to simply ignore them and they will go away (and I'm sure that this JE will start getting an influx of AC trolls just for mentioning this, so call it a 'test').
The only time I usually respond to a troll is when I'm completely unaffected by what they say, so that I can tease them about it. I call that fair game
Update: Safety Cap has a great analogy for trolls here. Its a response to a message I wrote that I made just before this JE that sums up this JE.