There are many rules about public transport etiquette that people only know if they take the bus or subway. One of the rules is standing up for the elderly and pregnant, especially if you’re occupying a priority seat. If you don’t do so, people are going to judge you. They might even take a selfie and expose you for being a jerk on Twitter.
Or your attempt at exposing someone else could blow up in your face. This lady called the younger people behind her inconsiderate for taking up the priority seats. However, it’s clear from her picture that there was an empty seat right next to the “inconsiderate youth.” Those darn kids and their 20/20 vision!