This is the only coherent moral system that exists. Morality only deals with conscious entities. Well-being is a spectrum in the same sense as the word health. We can argue the specifics, but all talk about moral outcomes involves happiness and suffering.

This is a simple precept out of which many positive things flow. Shifting our perspective to the well-being of others promotes our own happiness, as well as discourages in-group/out-group violence.

Taking offense serves no purpose other than to incite hatred. One may just as easily disagree without the useless baggage of claiming offense. Simply put: it adds nothing to the conversation on morality.