Go fuck yourself.
A cogent and persuasive argument indeed.
Apparently Horn didn't like his mention in the last paragraph of the post:
P.S. Be sure not to miss the obsequious edu-blogger, Jim Horn, sucking up at the foot of the hungry master in the comments. "Thank you for your eloquent commitment to what's right for so many years ... A trusted lieutenant, should you need one. Jim Horn" What a jackass.
I'm guessing it was the jackass line at the end.