Read here, and of course to call someone a "bastard" who is a potential candidate to be hired is inappropriate and out of proportion.

http://www.eslteachersboard.com/cgi-bin/forum/index.pl?read=9320

This happened on part of the potential employer in response to the potential candidate. British or not, being proud or not, to do such a thing on part of a potential employer is always inappropriate. The idiot who sent this email to the OP is a Chinese recruiter for the school or "school" who thought him/herself to be very smart and to play around with language whose meaning he/she did not know and the contexts within which it should be used.

It's a good example of total failure in cross-cultural communication. Some other posters paid this idiot back in like manner, see here:

http://www.eslteachersboard.com/cgi-bin/forum/index.pl?read=93219

And readers on here have had some fun. It's good entertainment with something to learn from it for each of us - what kind of treatment you should accept and not accept on part of Chinese employers!

那個人是王八蛋！