I saw it... I don't know if it makes him look like a jerk any more than it gives you a glimpse at what goes on behind the scenes are during a commercial break.
In defense of Berman, imagine you are reading a teleprompter on live television and you have people walking all around and providing enough distraction (that you cannot respond to), that you can easily lose your train of thought (i.e. wondering if they are going to walk into something/make a noise/etc).
The tirade is understandable...
As an aside, back in the early days of satellite television (when you had a dish in your backyard the size of which appeared that one was searching for life on other planets), I used to see things like this all the time during commerical breaks or during halftime of football games (when the announcers went to the studio in NY).
I've caught many an unvarnished comment from announcers regarding the game they were covering. Usually it was a one-sided conversation with either the guys in the truck or someone off camera, but they were funny when they occured.