It's not about the bike!
But even a slow to average rider like myself can feel the advantages of a quality road bike and clothing. Might I suggest you view this as a compliment to your riding strength, and not a put down of your bike? Mr. Roadie was thinking that if you had all the equipment advantages that he had, you would ...*ahem*... drop him like a hot potato.
Also, to someone who doesn't bike commute, finding the time and committment to ride a hundred miles a week shows dedication to the sport. He was surprised that someone with what he equates to road riding dedication has not invested in upgrades.
Like Bavarian3 said, he doesn't understand commuting culture.