I reckon the acceptability of hitting anyone of any gender is compleley dependant on context, when it comes to women in particular however I think (especially if you're trained) that the probable weight difference should be taken into account.
As for your own actions I don't see a problem. I wouldn't have got involved unless there was an actuall assault going on but that doesn't mean your concern was unwarrented and in both cases they began the physical coflict.
As for your own actions I don't see a problem. I wouldn't have got involved unless there was an actuall assault going on but that doesn't mean your concern was unwarrented and in both cases they began the physical coflict.