I only saw one particular case of un-GP it happened at the door of gate B. a mentor of a prominent championship semifinalist (who will go un named, I don't point fingers) was entering the gate. Unfortunately this man had such an attachment to his hazelnut creamer coffee that when he was told that it was not allowed in and he'd have to dispose of it or drink it to gain entry, he hollered at the door staff, then chucked it over 6 feet across the ground right by the trash can.
Being appalled as I was, I immediately picked up his cup, lid and holder and kindly placed it in the trash can. Then took the last 5 sips of my coffee and gladly entered. The man told me thank you, and I told him not to thank me. I told him sorry he had to deal with that.
Fortunately for me, that was the last and only un-gp behaviour I saw all day.
We need to all remember we are no better than our fellow man, no matter what job we all hold, what socio-economic status that's involved, or anything. Plain and simple, we're all fellow travelers on this
pale blue dot called Earth.