I know I'm not saying anything everyone here doesn't already know, but just because we're in the world of aviation doesn't mean we're immune to the occasional jacka$$ at work. Happens at all jobs. You can argue with the guy, but it probably won't change him.
A somewhat unrelated story from a month ago or so: A pilot comes up to the flight deck to introduce himself to me, and tells me that the gate agent gave him a boarding pass and said he didn't need a CA's signature. We (me, jumpseater, and FO) were all perplexed by this, but I assured him that he did need my signature, and thanked him for checking in regardless of what the agent told him.
True, and the more I think of it I highly doubt this story is true. I'm sure most all Captains know that a lot of corporate outfits wear bars and pay full fare for their seats. I dont think he would jump down the guys thraot without some investigating first.
As hard as it may be to believe, lots of pilots outside of the airlines are required to wear pilot uniforms when they perform their jobs (usually charter and fractional, but some corporate too). These pilots are often repositioned using the airlines, and are usually flying on expensive full fare tickets (usually purchased a day or two in advance). They don't need to explain their actions every time they fly on an airline.
I'd be pretty pissed off if you got in my face about it while I was minding my own business, doing my best to forget that I'm stuck in the back of an airline just so that I could get to work or go home. If you were pleasant about it, no problem. But demanding? Your boss would probably be getting a call.