Dear Fellow BIAB-ers,
I usually try and employ a refined and aristocratic response when I hear jabberwocky of this ilk.
First I usually say something like "Take off you hoser! You know you're a hoser, eh? And worse than, you're nothing but a Hosehead!!"
If that doesn't work, I will ask to hear something THEY recorded all by themselves. When it is done, I will say "Who recorded THAT--your grandma or your stoned uncle?"
If they are still arguing that Real Tracks are cheating at that point, I will pass them an acoustic and ask them to play something.
Then I will take it back from them and I will play something.
The conversation usually stops right there and they crawl away.
Hope that helps.