A general practice doc has about 15-20 minutes per patient to see you, examine you, diagnose you, propose a treatment plan, and then document the entire thing in your chart. You asked a question. He answered it. You decided to argue with him, citing God only knows what. He doesn't have time to track down whatever blog you've been reading and debunk whatever some voice on the internet is claiming is going to cure all ills. He's not going to argue with someone who feels like they're the medical expert because they read a few articles they searched up on the internet - and now wants to argue with the licensed, board-certified professional who's been practicing for 25 years.

I'd quickly end the consult too. There's far too much to do and far too little time to get bogged down arguing with a recalcitrant patient who doesn't want to listen to medical advise, but instead just wants to argue. He gave you an answer. If you don't like it, get a second opinion. If you really think he's wrong and it's dangerous, you could file a complaint with the State's Medical Board too and really be a burr up his ass. He'll have to take time out of his day, losing whatever revenue he could've made, to go stand before an inquisition and defend himself and his medical license. Do keep in mind though, this is the kind of thing that'll get you fired as a patient.