Tell him to point the Hubble telescope at the moon and show us the remains of those missions.
I would love to see a few old LEM's and the flags.
No one is going to waste valuable Hubble time (which many have waited years for) to take a picture just to satisfy a ridiculous conspiracy theory.
Tell you what, why don't you go ask Neil Armstrong whether or not he's lying about landing on the moon? Probably would give the old guy a coronary from laughing so hard.
They did already
http://www.nasa.gov/vision/universe/solarsystem/hubble_moon.html
The flag & rovers are too small to see
You don't need the Hubble, you can see the remains of the lander with a regular toystore telescope. Go poking around the sites eventually you'll find for small circles arranged in a square, that the legs of a lander.
Hubble cannot resolve those. Sorry.