"By the way, I don't think it's moral to call another person's morality horseshit. Your system of morals says this is okay. We have a small conflict there. No a

"By the way, I don't think it's moral to call another person's morality horseshit. Your system of morals says this is okay. We have a small conflict there. No amount of science will convince me otherwise." Hold your horses! He can perfectly well find it immoral to call your morality horseshit, and be conscientiously acting immorally!