Yea, sorry that happened to you. But I can't imagine I'd act any differently than did you. I'd be hoping that surely the experience would turn around, become more positive at any moment. That it never did is no way your fault. You know that, right? In this little hobby of ours sometimes lousy experiences, like shit, just happens. You came, paid, and left. Probably couldn't not pay without getting into some sort of a fight, and nobody knows where that might go. And you did have some sort of consensual contact, lousy as it was.
It was just a lousy experience. It sucks.
But there are a lot of good guys around, many on this site. Hope your next experience is wondrous, mind blowing, and ends way too soon.