Non-flat taxation are an attempt to make the impact of the law be equal on everyone.
Affirmative action is an attempt to alleviate the impact of prior laws and practices which made people unequal.
I am generally fine with trying to redress previously-enforced inequalities, and suspicious of anyone who isn't (protip: Google "libertarianism, starting right now" for an explanation of why this is important that you're more likely to agree with if a "LOL look how hard I rekt that dude by shoving affirmative action in his face" type sound-bite is the first thing you reach for in this kind of discussion)
Affirmative action is an attempt to alleviate the impact of prior laws and practices which made people unequal.
I am generally fine with trying to redress previously-enforced inequalities, and suspicious of anyone who isn't (protip: Google "libertarianism, starting right now" for an explanation of why this is important that you're more likely to agree with if a "LOL look how hard I rekt that dude by shoving affirmative action in his face" type sound-bite is the first thing you reach for in this kind of discussion)