What? OF COURSE he has a right to interfere, he can say whatever he damn well pleases. Furthermore, all he said was to knock it off; you seem to imply he lectured them or something similar.
He set an example by demonstrating their behavior was not socially acceptable.
Yup. Where I come from, this is what leadership looks like. Create the community in which you want to live and work--and if it the community in which you want to live and work doesn't have sexist dudes ripping on people for the fun of it, then make sure that they don't.
He set an example by demonstrating their behavior was not socially acceptable.