After dealing with this for 15 years, I've gotten to the point where I really could give a rat's ass what people think. Ignorant people will always be ignorant and at least you can take comfort in knowing that you are not afflicted with the "stupid" gene like they are. These kind of people are the ones that will let modern medicine kill them when they develop cancer. I've even had family members try to tell me things I knew weren't true and with them, I handle it in a more gentle way, but in so many terms, I tell them nicely they are wrong and when they are actually educated on the subject, then they can come to the table and talk to me about it. Otherwise, I don't need the stress, nor the debating experience. If non-family members still persist, cut them out of your life. You don't need that kind of negativity.