i think you're trying too hard to neg. negging is part of it but ya gotta be a little bit more subtlle. in a low intensity setting like a college dorm room, what you said is kinda harsh. in a club where girls are out with their friends, are all dressed up and actin like hot shit, that might fly. see the difference?
i'm an AFC as well but what has been working for me pretty well lately is "push pull."
you: so you're an only child? i can tell you're pretty spoiled.
HB: hey wtf, i'm not spoiled!
you: so you're not an only child? *stay serious and play innocent*
HB: blah blah blah
you: haha awright. *slight pause* you're pretty chill, i like you.
slight/subtle negs or teasing and low key compliments back and forth. keep doin it, keep messin with em. what's important here is to recognize the balance. pay very close attention to how she is reacting. can't neg em too hard or compliment them too much. just enough to keep them guessing if you're an asshole or a nice guy. i did this a few weeks ago and by the end of the night the girl was completely opening up to me, telling me life stories, letting me put her arm around her, i wasn't even push pulling anymore. the girl had a bf btw. anyway i didn't get my dick wet but that's still a work in progress, or should i should say i am.
also next time you decide to swig it, take half a long pull.