Tell him "Oh, so sorry, mate. I don't want to sound like (insert flute player here). I just want to sound like meself, and meself is having a real good time, are you?"

or....."Well, friend, that is the way I learned it from (insert famous player here), so that is the way I'll play it until I can ask him about it, OK?"

Or something along those lines. After all, just because you learned it off a recording does not mean you didn't learn it from so and so. I use Johnny Cunningham for this a lot.....simple, clean and beautiful. It is, however, very important to listen, listen, listen to trad music, because the stuff just doesn't translate well to paper. Use paper and ears both if necessary. But........

CARRY IT ON!!