I have just read the posting and feel equally incensed . . . and ashamed of someone who purports to be a fellow-countryman of mine.
I have no knowledge of that site and have no idea of the "history" of the person who posted the message; but, having simmered down, I am inclined to think that the message is far too extreme to be a genuine expression of sane opinion. Robbie's advice is right: such crass outpourings do not deserve the dignity of a response.