Why some women complain about inequality?

Agreed. But I think this complaining comes from two main sources; general ignorance and culture. For some muslim women, they have a good education, but when it comes to islam they know very little. I get shocked especially with women who were raised as Muslims in a Muslim country and yet some very basics about islam they do not know. The second group reject or complain about aspects of islam because in their culture these things are not the norm (the hijab for example) and they do not want to accept that their culture is wrong so they keep saying such things have no place in islam. And also keeping with the cultural aspect, sometimes cultural practices are the opposite of what islam says specifically when it comes to issues pertaining to women. So if a culture for example condones treating women badly, sometimes the women attribute this to islam instead of culture. I see this particularly to be the case with people who have left islam.