my selfishness hates your selfishness

I witnessed this moment on my flight yesterday that I have been putting a lot of thought into. You know that moment, I mean the very second, the plane has finished taxing up to the gate and everyone shoots up out of their chairs like their seat is on fire? They all the sudden have to get off the plane or they just might die? It never happens that you can just get off, you have to wait till they open the door, but everyone will stand up and get their stuff ready, I guess to save a few seconds. Anyway, this lady two seats up from me shot up and looked at the guy in the row accross the aisle and said, almost panicked, "Excuse me, I need to get my bag down I have a plane to catch in 30 minutes." The guy quickly complied. I then heard a lady two seats behind me say outloud, "Like none of the rest of us do." She said it to no one in particular, but really to everyone around her as if she hoped to find support in her disdain for this first lady.
I started thinking about that situation and about selfishness. The second lady was calling the first lady out on her selfishness, on the world being centered around her needs, but why did the second lady care? It had nothing to do with her, so why did it seem to affect her so? Selfishness is funny like that. If I am not concerned about my own well-being (selflessness) someone's selfishenss has no impact on me. But when another's selfishness begins to rub up against mine, that is when that "second lady" comes out. The selfishness of others is a threat to my selfishness, it rubs against it and makes me say and think things like, "As if she's the only one, I have a plane to catch to." If I wasn't selfish, or so concerned about my needs, lady one's comment would evaporate in the air. I saw more of lady two in myself than I would have liked.