I don't think the point of the discussion was that Jews would be offended if non-Jews use Cohen simply because it was Jewish. I think the point that was attempting to be conveyed was that the Kohanim were descendants of
Aaron who held a special role within the
Temple (the
Temple is sacred to Jews) and performed duties sacred to Jews, and it would therefore be an affront to the Jewish people to use a name associated with such a history.
http://en.wikipedia.org/wiki/Kohanim
This message was edited 8/23/2008, 1:29 PM