I remember when Ars misread their community a few times too.
"We will never have advertising on our site or charge for subscriptions!!!111" Ooops.
"Let's publish a series of articles from our IRC chat logs about one of our users the Great HooHA!" Whoops.
I would cautiously recommend Ars Staff be careful in their criticism of /. as it won't be long some Ars editor will step in it again too.