Of course, you could ask the same question and substitute any other general term for REALTORS. Obviously you must have had a bad experience. Was it with more than one REALTOR?
Yes, REALTORS do have to subscribe to a code of ethics and take classes to reinforce what is meant by those ethics. Violations of the code of ethics can result in sanctions against members of the National Association of REALTORS.
Any crooks in the real estate profession have, by definition, probably violated state laws and are subject to criminal prosecution, fines and revocation of their licenses. You should contact the director of the real estate commission in your state with your complaints.
The overwhelming majority of all the real estate agents I have known or worked with have been admirable in their honesty. However, in any group or class, there are bad individuals.
I am a real estate broker.