The problem is that it is self defeating. I'm not saying that some forms of knowledge cannot be subjective. I am saying that there ARE logical absolutes. That is the issue. Here is the point.
Logical absolutes exist.
They are, by nature, conceptual absolutes. They do not reside in matter. These logical absolutes cannot be quantified or tested in a lab. Yet, they exist. In fact, scientists USE these logical absolutes as a basis for verifying their science.