Trolls...
Ah well, I remember having to give up on a mechanical science forum because of one of those.
He kept arguing that imperial measurements were far superior to metrics and people were foolish enough to argue with him.
There is only one response to Trolls: ignore them.
Here is some counseling:
http://www.wikihow.com/Recognize-a-T...n-the-Internet
http://trollpolice.com/trolls-and-cyberstalkers/
~S~