People here are just used to the rush hour and constant busyness during the day. It's frustrating when you're in a rush and there's forever people standing around in groups awkwardly in the way whether on underground platforms, pavement or in a large shop. Although it's almost never pushing and shoving, it's more just getting unusually up close to people, and sometimes clothes sliding on them.
However, I do not push and shove and am aware of people's personal space. And majority of the time on the underground I remain standing throughout for the benefit of others to sit, and I apologise if I feel I have done wrong too.
And yes the underground is dirty but what do you expect? Wash your hands asap as soon as you get back home