More Annoyed
It seems like many people become much more aggressive the moment they set foot on public transportation, even when nothing is actually happening. Most people will fight tooth and nail to get the seat they prefer, and many do not mind being angry, rude, and disrespectful in the process.
Beyond Rude
The main issue of people being so rude while on public transportation is the fact that it is used by everyone, as the name implies. That means that anytime a group of strangers have to share a space, even though it would be best for everyone to respect one another, problems are bound to arise.