Have you ever looked beyond your own experience Marmark? Are you aware that it is less than 100 years since women in this country were given the same voting rights as men? Let alone all the other victories in employment, marriage, fertility control etc that were achieved throughout the 20th century. Look beyond that to a world where women are still the property of their fathers until they become the property of their husbands, they are sold like animals, beaten, abused, burned and killed without penalty, their bodies mutilated, their children taken from them, and so on and so on. Do you really need to ask 'why are we not equal to men'.
The issue of whether to call yourself Ms, Miss or Mrs may seem trivial but to many it is a symbol of where women stand in relation to men. Why does it bother you so much that some women choose to redefine such symbols?