Those asking why we are being so hostile and "antsy" to the OP, I suspect that it's because of his wide eyed tone of cluelessness.
It's because of shitty attitudes like his - the attitude that doesn't see women as properly human, so fails to see the sheer fucking cruelty of what his friend is doing - that men feel entitled to treat women like this.
If it were happening the other way round, he would immediately see what a shitty, shitty, shitty thing it is to do. He'd see the self-absorption, the casual cruelty, the self-justifying hypocrisy, the calculated manipulation, for what it was. He'd see his friend's pain as real. He'd see the wrong that was being done to him, for the horrific betrayal that it is.
It's because so many men don't really see the little women as being quite as human as them, that they are unable to empathise with women and see our pain as something a bit secondary to that felt by real people, men. And they excuse it as a regrettable detail, but really, not that important in the great scheme of things because the little women aren't that important in the great scheme of things - we're just satellites to the main planets. And so they enable the abuse of women by men, because they don't give the same weight to it, that they would give if their friends were abusing other men. The social opprobrium that men meet out to men who abuse men, is absent when those same men abuse women. It's bros before hos innit.
Most of the time we might have an uneasy feeling that that attitude lurks below the surface in many men, but we dismiss it as it's too uncomfortable to think about. But when it comes into our spaces and dances around in front of us and then asks what we think of it, it's not really that surprising that we get a bit hostile and antsy, is it?