The thing is, I don't read anywhere that she's being frisky at all. In fact, nowhere does he state that she reciprocated his touch. And to continue touching and go under the waist, when she's not reciprocating? No wonder she got up from her stool and took her distance from him. That's a clear sign he's overstepping her boundaries.
The goal is not to touch women, but to have them reciprocate the touch or at least respond positively. No response and no reciprocation means no escalation.
And going below the waist while sitting on barstools in her place of work, where everyone can see her being pawed? That is really socially uncalibrated.