The incident happened Thursday. If Friday's show was an hour like normally then we would have almost definitely seen it, but due to the shortened duration they cut it.
They do still have time to redeem themselves by showing a bit of it on Sunday following a cue by Sonia. I'll probably be unhappy if they don't show it at all though, it was pretty interesting to see how Ben snapped so quickly. As soon as Big Brother announced that two other HM's could enter the Chat Room, you can see Ben's face just drop - he obviously believed the Chat Room was strictly for he and Stacey alone, and didn't like that another pair were allowed its use. Big Brother clearly gets disgruntled when Ben asks him a self-absorbed question, and then when Ben cuts off Big Brother and says "Well, it seems to me that you didn't take your medication this morning" in such a tone... I guess it just goes to show what kind of character Benjamin is and how quickly he can say or do things without thinking (much like the water incident), even to authority.
Even if a lot of the Naughty Room footage isn't shown on Sunday, they should at least show the incident.