This made me laugh:

If your track coach tells you to run faster, and you answer with something about e=mc^2 and the light speed barrier, you're making a pretty strong claim about your current abilities.

It's from today's ACX piece which argues that we can and should think better, and that "everyone is biased" is a bad argument against trying.

This is close to what I think is the reason I don't like relativism or postmodernism. Pointing out that someone or some argument is not perfectly right is very much not the same as saying it is as bad as something else. There are gradations and they matter.