There's rules against eating food on planes? That's what I'm comparing this to: those who say eating pizza on a plane is inconsiderate. I fail to see how.
Let me be as clear as I can be: If I know that I'm going to be on a long flight and will be hungry during the flight, I will buy food at the airport to eat on the flight. If my choice of what to buy is pizza, I will buy pizza and then carry it on the plane and eat it on the plane. If someone on the plane doesn't like the smell of my pizza, that's too bad, but I'm hungry and I choose to eat pizza on the plane.
Airlines allow people to eat on their planes. DME doesn't allow people to eat on their buses. So, I'll eat on the plane, if need be. I won't eat on a DME bus, because there's rules against it. I'll throw away my own garbage on the plane and won't expect anyone else to clean up my stuff. Just as when I'm in the office. And if someone in the office doesn't like the smell of my food there, or someone on the plane doesn't like the smell of my food on the plane, that's just too bad. I'll eat it, and they can recover, after it's eaten.
Apparently, the only reason I should go hungry is because someone on the plane MAY not like the smell of my pizza. Not a good enough reason for me to go hungry.