Earlier quoted context omitted.
Instead of blaming others for being dumb, you might want to take the following brief blog post to heart: http://blog.codinghorror.com/but-you-did-not-persuade-me/
No, in this case, he was being dumb. He started out with a complete non sequitur, and then got fixated on that. Clarification: the guy was being dumb, but I was dumb for engaging with him in the first place. I'm in no way 'blaming' somebody for being dumb.
Yup, he was being dumb.