They're saying that just because you claim something ought to be a certain way it has no bearing in how it is, or ever was.
This is a common thing done by libs to support capitalism. They talk about how it "ought" to work, as if there is any way for capitalism to exist that is not inherently anti-social. Its a defense used by the cynical and well meaning alike, a deflection to ignore the reality of how these hierarchical relationships were always designed to be. Its similar to how libs say its not capitalism its "crony capitalism"
What you're saying ought to be not only isn't, but never was. And talking about how it "ought to be" isn't a defense of reality