Hello; A couple of questions come to mind. One is what is the man's ethnic background, from China or Vietnam, and why does this matter anyway?
Another is the notion he got a severe beating. Did he actually get a beating or get injured during the process of having to be removed from the plane? There is a difference, at least in my mind. A beating implies that the security/police took the opportunity to inflict blows just to cause injury.
My guess is the security/police would have been hands off had the man just gotten up and walked off. That they had to pick up from a seat a man resisting and then drag him may have caused injury.