Affirmative action was designed to help minorities have a chance to get into post-secondary schools. The issue with this is that it implies that minorities are not as capable and intelligent, leading to lower performance for those minorities. If everyone assumes you are stupid and incapable, it would be very difficult to get past that and strive for more. Lack of intelligence was never the cause of issue for students getting into post-secondary schools but this is implied by affirmative action.
You cannot expect to discriminate in order to end discrimination, two wrongs do not make a right. First of all some jobs are dominated by women and there has never been any movement arguing that they should discriminate against women in order to get men into these jobs. This law is based in the false premise that women are paid less than men for what they do, when if you look closely at the variables women earn equal to men for doing the exact same work. The reason some give for this legislation is that women on average earn less than men. This is true, but is a perfectly natural result of women's choices. Women are more likely to work part time, men are more likely to hold seniority at their place of work, women are more likely to choose a satisfying less paid job whereas men are more likely to work in unsatisfactory conditions for more pay. Supporters of affirmative action concentrate solely on the statistic that women earn less than men without evaluating the reasons for it, instead opting to create laws which will cause less skilled workers to get into places of crucial work within companies.