Anyone that is an experienced official and acts like a fanboy when they are in the stands should be punished! I can see this kind of behavior coming from a novice official that has only done rec ball and thinks he/she knows everything. I've had one official (that does H.S. & some small college ball but does not know the rules very good) that when waiting for the next game mouth/signal a travel or foul to me after a play. After each game that he does this I go over and explain why I did not call it that way. He's not yelling like a fanboy but he is making gestures for everyone to see (sitting next to scorer). A couple of times the coach saw this and it did not help the situation.
I felt vindicated a couple of months when we were working an 18yr old AAU girls game together. There were a number of things that he did that were wrong. He called in my primary a couple of times when he didn't get to see the whole play. He called a travel that wasn't a travel. He called over and back when it shouldn't have been. There were some other things that I can't remember now. At half time a fan comes down and sits next to my partner and starts telling him all of these things that he did wrong. I was sitting there wondering why he's letting this guy talk to him like this (even though he's right). For a minute the fan turns and talks to someone and my partner tells me that this is one of the top officials in the state and that he was here to watch his daughter. When he turns his attention back to us he leans over and asks me who I was. He said that I was doing a hell of a job and that he didn't have anything that he could critique me on. As a young official I can tell you that it felt great to hear this from a well respected official.
This is exactly how you handle a situation when you are watching a game as a fan. You approach the officials with respect and discuss rules/mechanics/position with them away from the fans. You always give them the benefit of the doubt that they might have seen the play in a different way.
This also taught me that you never know who is watching you officiate!