I adore teenagers, really I do. And I want to point out that I am not picking on you because you are teenagers. But, it is important to remember that a metro car is different from a school hallway. While you may think your comments (insults) back and forth are extremely clever, and even if they are, we should not all need to listen to them. If you want to converse, you should place yourselves in a proximity to one another, rather than standing (unnecessarily, since the car was not full) at opposite ends of the car, necessitating large volumes. Indoor voices should be a concept you have long since mastered.
Your Fellow Rider