> But when you kiss someone, and they fail to reciprocate...
It's likely that he didn't notice her not reciprocating the kiss. He might also have though she was just a bit shy or simply a bad kisser.
> In my mind, there's absolutely no room for grey area in this from the point she said "stop".
Agreed, no doubt about it. However, this is what she wrote:
"I told Joe to stop and reminded him he had a wife and children. He said, “Don’t’ worry about it we have an agreement”"
There's a massive difference between "Stop, I don't want this" and "Stop, we shouldn't do this because you have a wife and kids". It seems to me like Joe though she meant it the second way.
This whole story seems like a tragic case of serious miscommunication between two intoxicated people, not a vile act of evil.