Wait, you just said "objective" means true.
Now you say objective and true are different concepts.
No I didn't
Nobody chooses to go on a vacation of the abandoned factories of Toledo Ohio.
On the flip side, I don't think a rat cares if it lives in an abandoned Toledo factory, or in the Louvre in Paris
For me it comes to this: we can acquire objectively true knowledge about human ethics and human values, the same way we can acquire knowledge about science, history, and economics.
What I am rejecting is the notion that we cannot acquire any objectively true knowledge about human values because everything is supposedly relative and subjective.