All our lives we've had it shoved down our throats by pastors and priests (along with other things I hear), church elders, our parents, teachers, the law and the values of a christian society about what is good, godly behavior. Anyone standing on the street today is qualified to make that judgment because societal norms are not subjective.
Trump fails most tests by any reasonable metric. He is misogynistic, foul mouthed, misanthropic and discriminatory; he's uncompassionate, greedy, venal, lustful, combative, dishonest in the extreme; he's an adulterer, a defaulter a defrauder and a corrupt politician. And that's just the Trump we can see in public.