When a woman goes into a mans bathroom

This happened about a year ago at a popular resturant.I was using urinal and mens room was crowded when door opened and a woman in her 30’s was helping an elderly gentleman with a walker into the mens room and to the physical challenged stall.he went into the stall and she waited at the stall door while he did his buisness.she just stood there and looked around.well she took a verbal beating from men telling her to get the fk out to calling her a p*er checker men ran out and some tried to turn the other way.I told her there was a family bathroom and she stated he would not use it’s for children and even asked her why not the womens bathroom at least there are stalls she said he would never use a womans bathroom.I told her I think he’s selfish to put you through feeling awkard to the verbal abuse you are getting.she replied doesn’t bother me heard it all before and will again.she said he was her grandfather I told her I thought he was really being self centered to put you through this.then she became mad and told me it’s none of my f*n buisness.was I wrong to confront her and give her options??? But felt sorry for her in a way becuse of the abuse she was taking.but also felt sorry for the guys who ran out with pee running down their legs