I have once asked my Chinese staff why most mainland Chinese behave such manner. Being loud and like cutting queue. She told me that back in the early days under the communist teaching it's everything for themself and however they can try to get them first, they will get it.
And in the earlier days when they were poor they would not speak loudly but now that they are better off they want everybody to know. It doesn't matter how much they have but as long as they are spending the money they believe they are King. So such mentality are subjected to those people who doesn't know how handle their change in status. And that they still hold some of the ideas or habits that they have, but ignoring how they have affected others as well as how others would see them.
For the mainland Chinese to change in their behaviour and attitude would take at least 2 - 3 generations, as claimed by some of the Chinese I spoke with.