What European cultural practice was considered barbaric to the Chinese?

Public Physical Contact

Explanation:

 The European cultural practice of making physical contact in the public (for instance, shaking hands, holding hands or giving a hug) was considered barbaric to the Chinese. In Chinese culture and tradition, physical contact and touch should be minimized in public, even among the same sex.

the answern should be b, if it is the part where the mob has gathered

appeal to ethos is your answer.