You're answering mockery with an ad hominem, for which there is no need. Refuting something just because it sounds strange is like "check mate in 1" for the opponent. By going personal it's like snatching rhetorical defeat from the jaws of victory. It makes you look like you have no strong argument when in fact you do. It's even contained in the ad hominem ("good understanding" etc.), but by making the matter personal you're invalidating it.

Also, I very much doubt XiXiDu belongs in the reference class of "average road builder, baker or gardener", just as you don't belong in the "average Greek" reference class. I know you guys are strongly at odds, but do you think the average road builder uses "epistemically speaking" in their common parlance? Proof by active vocabulary.