Is Chivalry Dead?

Nowadays, people become more and more impolite when they taking the public transportation. For example, didn't give up seat to people who need it. Talk with people loudly. Put the feet on the seat. Even to play with friends on the bus. That was very rude. I think the cause of this phenomenon is likely related to their habits. Maybe their parents didn't tell them what is polite and what is not polite. So the children just do what they think there is nothing wrong with things, and then slowly become a habit. They don't care about other people's things, they only care about themselves.
In order to let everybody have a comfortable environment by taking public transpotation I think this behavior should be corrected.