That would be true if the society was already perfectly fair and neutral (which some people believe).
However, there is racism and sexism in the world (it's systemic, in a sense it's not about one person not liking another personally, but biases propagated throughout the society). To counter that, you need to recognize it, and it will be necessary to treat some people differently.
For example, women may not feel safe being a small minority at a gathering full of men. If you do nothing, many potentially interested women will not show up. You could conclude that it's just the way things are and women are simply not interested enough in the topic, or you could acknowledge the gender-specific issue and do something about it. But this isn't a problem affecting everyone equally, so it would require treating women specially.
However, there is racism and sexism in the world (it's systemic, in a sense it's not about one person not liking another personally, but biases propagated throughout the society). To counter that, you need to recognize it, and it will be necessary to treat some people differently.
For example, women may not feel safe being a small minority at a gathering full of men. If you do nothing, many potentially interested women will not show up. You could conclude that it's just the way things are and women are simply not interested enough in the topic, or you could acknowledge the gender-specific issue and do something about it. But this isn't a problem affecting everyone equally, so it would require treating women specially.