That's just so galactically stupid I don't even know what to say. Honestly, if I had been in that exact same situation I may have burst a blood vessel in my brain right then and there from the sheer idiocy of it all.

You may as well reply with "I know it's not much, but I make up for it by watching at least 50km of the Tour de France which I've taped whilst on my couch recovering with some potato chips." That would make exactly as much sense as what he said to you.