There is virtually zero chance that a bar would be found guilty of illegal discrimination for banning an individual woman unless there were witnesses or recordi

There is virtually zero chance that a bar would be found guilty of illegal discrimination for banning an individual woman unless there were witnesses or recordings establishing that they did so specifically on the basis of gender. Proving discrimination, even by the lower standards of civil court, generally requires either a well-documented pattern of behavior or (as mentioned above) evidence that the customer was banned due specifically to their gender.