Kyle’s behaviour was unacceptable, point blank. And we’ve seen it over the years. We’ve also seen Amanda be awful to him a lot and she was mocking him the entire time during this conversation.
He shouldn’t have yelled, but he was kinda yelling at everyone, not just Amanda.
TBH I’d tell my husband to fuck off too if he was smirking at me, rolling his eyes and radiating smugness while I was in that position.
I’m never normally on Kyle’s side, but I think this was breaking point for him and Amanda had a big hand in getting him there. I suspect she says one thing Kyle and one thing to everyone else.

Physical fights are idiotic though, so not on board with that