I know that some people will be embarrassed when their lack of manners is pointed out. However, more and more people are getting very brazen.
I take a commuter bus to work. In the afternoon, there are usually a lot of people yakking it up on the cell phone. Yesterday, a woman asked the person next to her to please lower her voice. The person she asked, well-dressed, professional attire, screamed "*&#k you!" and proceeded to talk every louder just to annoy people.
Being a polite society, we just sat there.