I did. It's really easy to call someone dumb and try to re-educate them. So I tried to appeal to their inquisitive mind (conspiracy theorists diehard web trawling) and suggest some other questions:
Love it, thousands of years of scientific discovery all discarded because he can't understand it after a few hours of googling. Arrogant in the extreme
Have you thought about just not talking to them again? Life is too short