People in general are ruder today, not just teens but many adults and older people as well. I got some choice words from a elderly gentleman who was blocking an aisle at the football game (and knew he was), yet got angry when I finally stepped over him after saying excuse me several times.
There are sadly just as many middle age and elderly people who think due to their age they are entitled to be rude and not be called on it. Hard to teach the younger generation not to be rude when we can't do it ourselves.