Postmodern moral relativism asserts truth is relative and there are no absolutes. But it’s asserting an absolute, while denying it at the same time. This is inherently contradictive, making it illogically incoherent. Going against reason and basic common sense.
There is therefore, no such thing as my truth and your truth. If your truth contradicts my truth then both truths can not be true at the same time. Either I am wrong or the other is or both. Truth has to be logically coherent in conjunction with reality. If not then it can’t be true.