You're doing it wrong.
Guys read up some game stuff and they think "oh ok, so before I was being real nice, so now I'll just do the opposite and insult women and then I'll get chicks"
It doesn't work like that.
The point about being an AFC is that you're being TOO nice and doing it really obviously to try to (i) buy affection (ii) keep building rapport (iii) never risk losing rapport by teasing (iv) never risk losing rapport by sexually escalating (v) going out of your way to do nice things when she's done nothing to deserve them
You can still be a nice, friendly guy. Just do good things when she does things you like. Don't always agree with her, be willing to make fun of her a little, and be man enough to sexually escalate and communicate that you are interested in her. However, if you actually hit a real commonality, it's OK to say "hey that's really cool you're into that!" as long as it's in the context of a conversation where you've also said "omg you're such a DORK for liking that!" as well.
Get it?
I seriously do not ever neg. Ever. And bitches love me
http://www.youtube.com/watch?v=q-b0UQFrSkM