Full Idea
It is surely possible, and indeed often the case, that people who violate no duty nevertheless behave in an inhumane and a disgusting manner.
Gist of Idea
Behaviour may be disgusting or inhumane, but violate no duty
Source
Daniel Statman (Introduction to Virtue Ethics [1997], §1)
Book Reference
'Virtue Ethics', ed/tr. Statman,Daniel [Edinburgh 1997], p.7
A Reaction
This seems right, though it is easier to be disgusting than to be inhumane if no duty is to be violated. Social duties may not require a high degree of humanity, pure Kantian duties might.