TBF if she joined in the banter, and didn't say at the time that she was uncomfortable with it, then how was he supposed to know to back off?
Because he's a grown up. Being a grown means you learn how to behave, and for men that is knowing your dont behave towards wome like that.
I regularly deal with employees who have taken horseplay way too far. However, if they don't immediately object, it's difficult to see in hindsight how they were offended.
Seriously? How would anyone on FWR think this is okay.
Day after day there are articles and news reports about how women feel intimidated and undermined by men not bothering to learn how to be a decent human being.
I would like to think that someone who has employees has created a staff ethos that such sort of behaviour never happens. A workplace isn't some sleazy night club.