All men want respect, health, and honesty, and dislike disrespect, diseases, and dishonesty (excluding the aforementioned crazy person). — Samuel Lacrampe

I disagree with this point, as it excludes the "crazy person" as being someone to which a code of justice or morals would not apply to. If there is someone who likes disrespect, diseases, and dishonesty it does not make them separate from morality, if morality is truly objective. If morals are objective, they would have to apply to everyone regardless of mental state.

Math is clearly objective; therefore there is a flaw in the logic. — Samuel Lacrampe

Math, being a system of defining the world invented by humans, is not necessarily objective. It could be argued that the things that math defines are objective, but it does not make math itself objective. Similarly, the things that language defines may be objective, but language itself is not.