He’s gaming the system and what HR would do with the info if they found out, I don’t know. He should never have told the LW and his bragging makes it clear he does not value care giving as something more important than making money or even equal to it. Which makes him a misogynist tool. LW shouldn’t waste time wondering why he told her, nor should she take on the blow back she would get from him and his friends who are probably the aggressive money making types and will take it out on her. I don’t see what good she would do in exposing him to HR. He’s LW’s coworker, but she should not consider him a friend and keep interactions at arms length. For one thing, it will relieve LW of hearing more about the patriarchal crap he’s getting away with at the expense of everyone else. She should save her energy for coworkers she respects and who deserve it.