If you're doing the wrong thing and someone walks up to you and says " Mate, what do you think you're doing? " , you know, they're pissed off right and that's Australian for annoyed.
While it's tempting to lash out at the things and people you don't like, it's always safer to be a source of positivity and encouragement, especially around people you barely know.
Always let the people, who are on the train, off first, before you go on. Because you can get some really angry people who can end up getting angry at you, if you don't let them off first.