Re: Boy Friend trick
Simple answer, is to play it off.
IE "I don't date people I just meet" or something similar
You need to send the impression that she hasn't won you over. You need to show interest but you aren't committed to the idea of dating her. Almost any disqualifying statement would work. I don't typically date blondes, so you are safe. Or whatever.
Show slight interest, then disqualify her without completely slamming the door in her face.
In my opinion this is the best way to side step that song and dance.
Learn to be a better person not a better player.