Uh-oh! A Selfish New Ploy by Airline Passengers?

I don’t know why I haven’t noticed this before, but on my recent flight from LA to Chicago I realized that there is yet another thoughtless kind of traveler contributing to the lack of friendliness in the skies.

These selfish people had seats located in the back of the plane, so when general boarding began, they were sent onto the plane first. But I noticed several of them stopping on their way to the rear of the plane to reach up and shove their carry-on bags into the overhead bins much closer to the front of the plane, then walk on back to their assigned seats in the rear. When we arrived at Chicago, all they had to do was get up and head to the front of the plane, pluck their suitcase out of the bin at the very front of coach class, and be on their way.
The problem is, that screws the people assigned to those seats in the first few rows. By the time they boarded the plane back in LA, all the space in the overhead bins above their seats was taken and they had to find room for their bags in the back of the plane. When we got to Chicago and their turn came to exit the plane, they couldn’t get to their bags … couldn’t possibly buck the flow of passengers coming at them up he aisle. They had no choice but to wait until the last people left, then head back to collect their bags. Meantime, the people who had caused all this inconvenience were long gone … and probably first in line for a taxi to boot!
Has anyone else noticed this? Maybe it isn’t a common practice. I certainly hope not. It would be just one more reason, added to the long list, to hate flying.