Women before eleven are FREE

One thing I have noticed is how women get in for free at night clubs before eleven . In some cases there are "ladies night" where women get in for free no matter what time. Is this really fair? What is the message sent out to women and men? A feminist would say this is not right, they would see it as the night clubs saying that women are economically vulnerable. Or would they? The way I see it is if feminists were offended by this wouldn't their be rallies and protest against this? People could argue that feminists are acting as men and taking advantage of the system and violating the rights of men being seen as equal to women. Does this not contradict their focus on equality? That Women are equal to men not that women are superior to men.