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I didn't try to escalate beyond that because I thought it was more of her having fun sort of thing than flirting.
until you get better at calibrating interest assume attraction over friendly, risk creepy, you are better off being labeled as the sexually aggressive creeper then the friendly, safe guy. Your success and game will get better much faster this way. Eventually you will know the difference easily, mostly because you will be deciding her interest level for her.
If your waiting around for a chick to clearly or overtly display or express interest you are blowing the vast majority of opportunities with woman. I know because I did this lame shit for years.
And finally the truth of the matter of "was she being friendly or flirty?" Yes and Yes, the answer isnt mutually exclusive. If the possibility of sexual interest was not in her mien she would never have worn your hate. If a girl asked her "did you like that guy" chances are should would have answered "no" or "i don't know". The hat wearing is a unconscious invitation to escalate. This again is 9/10 opportunities that are going to cross your path, that your in the AFC habit of missing and losing, where as a PUA would always follow up and attempt to escalate.