Guys on here are too heavy on the "criticism" and too light on the "constructive".
I agree that that was pretty terrible. BUT, good on you for giving it a shot, even if it was only facebook. You've gotta start somewhere, so don't worry about these scew ups. They are an excellent way to learn.
Your biggest mistake was going on WAY too long with the spell stuff. She actually seemed at least semi-interested/intrigued by it at the start, but your delivery was not good and she was clearly losing interest , but you still persisted with it for way beyond the point you should have quit (and started on some other line).
Second, you were also way over the top with the negs. Listen, save the negs for the REALLY hot ones. And even then use them sparingly and only if she is showing too much attitude. On less than 8s, negs are not a good idea at all, unless she is being a real bytch. This girl didn't do anything to earn negs about her being "dorky". You basically just ended INSULTING this girl...which is why she eventually told you to get fkked:
hahah YEAH okay, nice try. sorry but I ain't interested in you. it's okay, I don't want to talk to you anymore anyways.
and don't worry, it's not a spell. it's reality.
And she did it with style too! "And don't worry it's not a spell, it's reality" LOL, man she BURIED you with that one. ROFLMAO!
To sum it up, my main advice to you would be to stop trying so hard. It's perfectly FINE to relate to a girl simply as a human being, just talking about normal stuff for a bit. Now, sure, you need to spice it up a bit too, but do it sparingly. You were basically trying to hit a cnf home run with every line. Ease off the pedal a bit man.