You just have to keep killing whoever you get tagged as until it goes right, one of my chars went thru well over 15 tags before it changed from xeno to lane hacker.
Us old timers do take the time to explain how the RP works, however if people ignore or just shoot you without saying anything, it's abit hard to get them to understand.
As for the 'leave me alone' that only works when the player your asking isn't a complete and utter *******, unfortunately there are a few on the server who are.
Then again, the question becomes... if you don't want to RP at all... Why the hell are you playing on an RP server?