KaliYugaz

The truth of moral realism is a meta-ethical fact that doesn't preclude debate and experimentation regarding what the Good actually is. Just like how the existence of an objective material reality is a fact assumed by science without precluding scientific debate and experimentation regarding the nature of that reality.

>There's no objective morality and no objective politics.

Really? The majority of academic philosophers disagree with you, and they have very good arguments for moral realism.

One thing to think about: it's not possible to affirm objective standards of rationality and deny objective standards of morality at the same time without being inconsistent, since both epistemology and ethics deal with normative statements (what one ought to do), not fact statements.

Are you really arguing that there are no objective standards by which we can judge rationality?