You said worst. sound. ever.
Obviously, a strong statement that drew some ire.

Greg himself had a simple and professional reply.

"I welcome the opportunity to speak with you, Personally, about your experience so that together we may reach an understanding of what went wrong in the demonstration and reach a practical understanding of our Road Case Demo methodology pursuant to you properly and accurately evaluating our product on your terms rather than dismissing it based on a demonstration methodology that you believe to be flawed and incapable of revealing the product’s true capabilities.

Let’s work together to remove the if’s and what-fors of our introductory demonstration method and determine the capabilities or lack-there-of, of our product on your terms."

Then:

"I should not have been so brief and negative."

Excellent! It will work itself out!

If these were the only two voices that were heard after your initial comment, the story would be much simpler.