And yours is a disingenous response. So it's an ad hominem attack to call someone a libertarian or to point out that legalized abortion is a position that no authentic conservative could possible support?
It could be objectively wrong for any number of reasons, including religious, health, Mrs Grundy's disapproval, psychobabble, etc.
No, something is objectively wrong when it contradicts truth, but it's interesting to note your implied distate of anything that smacks of relgion, Mrs, Grundy, or pyschobabble. No implied ad hominems there, eh?
You apparently aren't even aware that the discussion was about legalized prostitution, let alone describe why the same is objectively wrong.
Care to try again or shall we give up ?