Not everything. 25 lbs. weighs more than 20 lbs. for example. One car travels 1/4 mile faster/quicker than another. Those are objective tests...but the quality of something being overrated (or underrated) is a matter of deserved, positive attention IMO.
Remember the zen koan: If a tree falls in the forest and no one is around to hear it, does it make a sound?
If you have an equation and no one is around to calculate it, does it result in an incremental number sequence?
That is an imaginary supposition, not a objective statement.
Besides, someone in space would tell you that a 25lb mass object and a 20lb mass object both have the same weight and that would be true. weight is the force of gravity on an object, which is a subjective phenomenon, as is a persons ability to gauge an objects mass. you only think that 25 pounds is heavier than 20 because it seems heavier to you, but if you couldn't tell which one was heavier, then you wouldn't know which one had more mass.
Same with the car. A dial tells you that it is traveling 1/4 mile faster than another car. From your point of view the gauge is the objective measurement and you are reading it subjectively. If you were to observe two cars traveling past you, you could only tell their relative position from each other, not how fast they were going.
A fact and an objective experience aren't the same thing. A fact is merely something that can be demonstrated by different subjective experiences. An objective experience is something that happens not only regardless of any different subjective experiences, but it doesn't require any subjective experiences to happen.
the tree falls and it makes a sound. that is objective. someone hearing that sound is subjective.
The earth revolves around the sun; that's a fact.
But it's not an objective statement because no one has ever directly observed it happening.
Newton's laws of motion are objective statements, because so far, everyone has experienced them in exactly the same way.