Objective truths are true whether you accept it or not, it is the truth even without you. Now, there are objective truths that are commonly accepted by all because it’s easy to understand or easily recognizable as truth. Example: The sky is blue, the wheels are round, etc.
In this kind of basic easily recognizable truth, whatever your sense perceived is also what my senses perceived. But, when this truth gets deeper, a person from another person may differ in truth yet still the truth, is just that, the other one cannot seem to fathom the deeper truth that the other perceived.
Example: Newton and Einstein.
They have a lot of truth that are in agreement so long as the other can reach what the other perceived and vice versa
But, when it comes to gravity.
Newton’s law states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
But, Einstein describes gravity accurately not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass.
You see, newton’s objective truth was true to some extent but was lacking to Einstein’s perspective.
Here, their truths were not on the same level anymore.
So you see, our objective truth really is a subset of our subjective ability to perceived the truth, it may seem to be not like it because we share a lot of basic objective common truth but this phenomenon is clear the deeper you go.