"If the primary ingredients are made available for its proper function, the body will never engage in making things harmful to itself."
This pertains to proper diet and exercise and, if necessary, vitamin and mineral supplements. There is nothing in this quote that says nor implies that pharmaceuticals are included as "primary ingredients".
Depending on what kind of homeopathy they guy is talking about he could be right or he could be wrong. I believe, however, that he is talking about giving the body the chance to take care of itself (as it was designed to do) rather than pump a lot of chemicals into it (which it was not designed to do).
Maybe he talks so much because you won't listen. Try listening to what he has to say and then do some research to validate his claims - one of two things will happen: 1) you'll be able to prove him wrong, or 2) you might actually learn something.