Un-Aware Humans When Out In Public
Listen, it literally costs nothing to have some good manners. It is public etiquette to be aware of your surroundings, especially in public, knowing that you are not the only one acquiring the space. You have to consider other people that are around you. They respect your boundaries, so you should reciprocate that respect and respect theirs, too.
One of the most common things that people with no awareness do is cutting in line. I mean, there is literally a long queue of people behind you, and you would just cut the line? How very dare you, Karen. Being selfish never brought anyone any good. It costs nothing to be kind.