Personally, I let it go, people only come up with that rubbish due to a lack of understanding, member of mensa or not (maybe theres a misconception of mensa members in there...).

Its like people seeing some one playing say the drums or guitar, and with no knowlage of the instrument go "ohh I can do that, it looks really easy." Which I would take as a compliment.

Untill they actually try it its only then thay can have a true informed opinion.

Ohh and they wll be looking for the "make cool" button or the "realistic render slider" within 10 mins flat.