The knowledge contradiction does not exist. Your truth claims are of an ontological nature — that is, what REALITY IS.
The rejection of ontological claims is not ontological, it is epistemology — that is, THE LIMITS OF KNOWLEDGE.
No matter how hard you insist your assumptions are justified, it falls back on flawed logical premises. The Truth fundamentalists insists Truth is True because Truth MUST BE True. Its circular thinking predicated on humanity’s juvenile need to derive power over others by trapping them in a prison of absolutes and certainties that encourage the behaviors desired by the Truthpusher.
Simply quiet your mind to the persistent need to have an ideological lasso and over time you will develop the dignity and courage to accept your experiences and perspectives without forcing them into dogmatic universal interpretations.