She didn’t take the other passengers into account at all
Everyone who takes the train knows that getting from point A to point B isn’t the same as when you have your own car. Besides the fact that there’s a set route, you have to be mindful of others. Lunch with a smell that packs a punch? Your fellow passengers won’t be too pleased if you decide to eat it in a packed train.
This is one of the unwritten rules of using public transit. Just like in all other places where there are several other people around, there’s a certain behavior expected of you in the train, things that don’t necessarily go against the rules set in place by the transit company itself. When one woman decided to not follow this train etiquette, the rest of the passengers had something to say about it.