There is, of course, a variation of how docs feel about PAs. I've had mostly really great experiences through my training with preceptors and my encounters with docs has been--for the most part--really positive. My ER preceptor, an MD, holds PAs in high regards and outwardly knocks NPs. One day, I asked him why he didn't like the NPs there at the ER. He paused, handed me an X-ray he was looking at and asked me what I saw. I told him that it was a normal CXR. He then said, that's why. I said, huh? He replied, "our NP, who's been here for 5 years just gave me this CXR and was concerned about a 'cancer' in the lung, and she was looking at the shadow of the scapula."
Anyway... sorry for the tangent. That was one experience. As I've been working, most docs seem to respect PAs. There are a few, who I've talked with when doing rounds, who make it very clear that they do not think too much of PAs. These two I'm talking about are much older.
The way I see it: There's much to gain from being a team player. If one chooses to not be a team player, then it is certainly their loss!