I am curious about your attitude toward the agent to begin with, were you pleasant or were you telling him what you can or can't do. Hope777 was right in the fact that your ticket wasn't actually legit. You can't buy a round trip and then fly another round trip in the middle. However most agents will ignore this and go ahead and check your bag the whole way. We know why people do it and don't blame them.
Sabre unfortunately isn't the most user friendly system around, perhaps you got someone new or someone that hasn't done that entry in awhile. It's not terribly easy trying to rack your brain to remember how to do an entry you know is easy, but can't get it to take because you are doing it wrong. Making comments or huffing at the agent isn't going to help matters. Did his sarcasm match yours? Honestly I have been guilty of that. I will hold back as long as I can but when I am geniunely trying to help someone and all I get is attitude, I have on occasion given what I am getting from them. It's not something I do often, but when I am breaking rules for you, you ought to be nice. Also when you give the attitude back, sometimes they then realize how they were acting and will stop.
This is not the majority of people, I agree with Piney in the without the passengers there is no USAirways. However, there are limits to everyone. If you gave some attitude then you have no right to be upset that you got it back. Although I am guessing you will say you didn't.
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