“Objectivity” is about reflecting well the object of reference. Reality is “objective” in that it is outside of us and not mind-dependent. Our knowledge of it is only through fallible evidence, not indubitable knowledge. That isn’t to say we can’t know anything—there are things that it is easier and harder to get good knowledge of, and some evidence is more or less fallible.

What I’m saying here is that there is no indubitable foundation of knowledge that any rational person must accept a priori: people are susceptible to all sorts of distortions to their knowledge, not least of which being self-deception! Fewer people are likely to have reason to be self-deceived about the number of people living in Nome, AK over 6' tall. Quite a lot of people might be self-deceived about how power is arranged in the society they live in. There’s no silver bullet—we have to engage in the process of making judgments with other people, and we will never be 100% certain about our knowledge because we’re simply fallible human beings. As Paul says, “now we know in part.”