"Chinese are masters of forgery and fakes. 
They are skilled at making fake designer 
clothing, watches, Japanese robot toys, anime 
DVDs and now artwork!"

This is just really rude & uncalled for.  I 
really don't think you can pigeon-hole any one 
ethnicity into a characteristic like this.

As for being rude & direct online, Americans rate 
#1 in my book.   Would you honestly make this 
statement in person, with a mixed audience?  

Your warning was a nice public service.  You have 
the unique position to know the history about a 
particular item & rather then let some collector 
make a costly mistake, you spoke up.  It is a 
shame you had to mar it with (what I consider at 
any rate) an ethnic slur.
Anna