It’s true.  Most conventional (allopathic) physicians are opposed to even hearing about homeopathy or any type of holistic medicine.  Many will try to dissuade you from seeing a homeopath, naturopath, chiropractor, herbologist, etc. and mention reasons why these holistic techniques might harm you.
Many conventional physicians ridicule natural medicine and describe it (inaccurately) as nothing more than an expensive placebo.
Most of these physicians are simply uninformed about natural medicine.  They have never experienced the effects of natural medicine, have never studied it, and have no basis by which to judge it objectively or scientifically.
Many physicians might feel threatened by things that they do not understand, or things that they were not taught in medical school.   Some of the principles of natural medicine might seem to run contrary to the doctrines of medical schools.
Natural medicine advocates a holistic view of the body and how the effect of lifestyle and environment factors play a role in ones overall wellbeing.  It respects self-healing, personal responsibility, and nature's ecology, principles that are still not taught in most medical schools.
Even physicians who have received training in some forms of Complementary and Alternative Medicine (CAM) or Integrative Medicine tend to dismiss other natural medicines simply because they lack experience with them.
Interestingly, when the American Medical Association (AMA) was founded in 1847, their charter specifically forbade members from associating with, referring to, or fraternizing with Homeopathic and Naturopathic Physicians.  The AMA is a trade organization who’s “beef” had nothing to do with providing a better, safer, more economical form of medicine, but was a “turf battle” to fight competition from natural physicians. This was about money, not science.
Let us note that we are also seeing more acceptance than ever as the role and positive influence of natural medicine grows.  We are looking forward to the future of medicine, health and personal care.