People not using headphones in public, and other irritations

I get really irritated with people watching things on their phone full blast with no headphones, I would rather listen to screaming children or honking horns given the choice. I think in the West that would annoy a lot of people, but I live in China where it seems most people have no problem. The other thing is when someone sits next to me and keeps leaning into me or their leg keeps shaking. I find behaviour such as these means that I am acutely aware of other people's existence in every moment, so it is hard to relax at all.