Recently I was at a wedding (my sister in law's) where the photographer that was officially covering the wedding was rude about me supposedly blocking her second shooter (when I was consciously watching the second shooter the entire time in question and was actively staying out of the way of any shot the shooter attempted.) The primary shooter told me to back off to prevent blocking shots. I objected that avoiding being her way is my top priority and that I was watching her second shooter the entire time. She blew this off and continued insisting that I agree to back off even though I was already saying I would stay out her way, just like I had been doing, but yet she kept pushing and seemed to want me to admit to blocking her shooter, to the point of being insulting.
I chose to just appease her and not force the issue because I absolutely didn't want to cause any problems for my sister in law, but the behavior of the photographers had a major negative impact for me personally both because of the rudeness and it causing me to be nervous the rest of the night.
I didn't want to step on their toes, nor did I want to be acting in a professional capacity as I was there primarily to be a guest and distant secondarily wanting to make sure I captured some great moments for myself and secondarily to protect against my sister in law and her husband from being stuck with few or no good images of their wedding, should they have ended up not being happy with the photographers they hired. Normally, I head off any issues pro-actively by talking to the official photographer early to let them know who I am, what my goals are, how/when I will likely be shooting and how they can easily communicate with me if there are any issues, but in this case, it started off on the wrong foot before I could do so.
In situations like this, where you are a skilled professional photographer, familiar with the industry and able to avoid causing problems, what techniques have you found work well for dealing with (or avoiding) an overly aggressive, protective, or rude official photographer who seems more insistent on causing issues than working things out in a way that works for everyone?
Update: To try to narrow things in on more direct answers, please assume the following (I don't care if you think they apply to my particular situation or not, because the question is not intended to be about me, but I want this answer out there to help anyone that might end up in a similar situation. Answers that ignore the question's premise don't provide meaningful data as the question already agrees with those points as a starting point.):
In the situation, the guest is (and should be) behaving as a guest. They are getting occasional shots, primarily from a guests perspective or in a way that a guest would behave. (Shooting from at or near their seat, only wandering around during parts that guests typical wander around, not shooting anything of the organized portraits, etc)
In the situation, the guest is not actually in the way (and should not be). They are being extremely mindful of their surroundings and will not even raise their camera if they don't know where every working lens in the room is and know that they aren't in a shot, even if they could get a better angle.
In the situation, the guest was never anything but polite, professional and civil towards the working professionals, though reasons why the professionals may have seen things as impolite or rude given the above would be good feedback, particularly if supported with a way to figure out if that was the photographer's problem and how to ensure them it will be mitigated.
These three things need to be true before this question even becomes relevant, because if they are not, then the photographer certainly has good reasons to be concerned and the only answer would be to actually address their valid concerns, but perhaps ask them to be more polite.
I'm specifically looking for ways to get things back on a polite footing when you've done nothing but actively try to avoid stepping on toes and yet the photographer is upset and being rude. An example of a valid answer would be "Unfortunately there is nothing you can do without risking a scene, so you just need to cave, even if they are rude and flat out wrong about the situation." (which is basically what I did in this case) though I'm really hoping there are better answers out there.